慕课网-安卓攻城狮视频学习及练习（一）

初学安卓，次次卡在button的事件监听处。这次要一鼓作气，把这个处理点击事件的机制看得赤裸裸！

 1 public void onCreate(Bundle savedInstanceState) {
 2         super.onCreate(savedInstanceState);
 3         setContentView(R.layout.activity_main);
 4         btndo=(Button)findViewById(R.id.button1);
 5         txtShow=(TextView)findViewById(R.id.textView1);
 6         btndo.setOnClickListener(btndoListener);
 7 
 8     }
 9 
10 private Button.OnClickListener btndoListener=new
11 Button.OnClickListener(){
12     public void onClick (View v){
13         txtShow.setText("你按到我了！");
14     }
15 };

匿名内部类：

public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        btndo=(Button)findViewById(R.id.button1);
        txtShow=(TextView)findViewById(R.id.textView1);
        btndo.setOnClickListener(new OnClickListener(){
            public void onClick (View v){
                txtShow.setText("你按到我了！");
            }
            });

    }

英里转换器

 1 private Button btndo;
 2     private TextView txtShow;
 3     private EditText editdo;
 4     @Override
 5     public void onCreate(Bundle savedInstanceState) {
 6         super.onCreate(savedInstanceState);
 7         setContentView(R.layout.activity_main);
 8         btndo=(Button)findViewById(R.id.button1);
 9         txtShow=(TextView)findViewById(R.id.textView2);
10         editdo=(EditText)findViewById(R.id.editView1);
11         btndo.setOnClickListener(new OnClickListener(){
12             public void onClick (View v){
13                 int miles=Integer.parseInt(editdo.getText().toString());
14                 double km =1.61*(double)miles;
15                 txtShow.setText("时速"+km+"公里");
16             }
17             });
18 
19 
20     }

多按钮共享事件 switch的应用

 1 public void onCreate(Bundle savedInstanceState) {
 2         super.onCreate(savedInstanceState);
 3         setContentView(R.layout.activity_main);
 4         bt1=(Button)findViewById(R.id.button1);
 5         bt2=(Button)findViewById(R.id.button2);
 6         bt3=(Button)findViewById(R.id.button3);
 7         text1=(TextView)findViewById(R.id.textView1);
 8 
 9         bt1.setOnClickListener(myListener);
10         bt2.setOnClickListener(myListener);
11         bt3.setOnClickListener(myListener);
12 
13     }       
14             private Button.OnClickListener myListener=new 
15                     Button.OnClickListener(){
16 
17                 public void onClick(View v){
18                     String s=text1.getText().toString();
19                     switch(v.getId()){
20                     case R.id.button1:
21                     text1.setText(s+"0");
22                     break;
23 
24                     case R.id.button2:
25                     {text1.setText(s+"1");
26                     break;
27                     }
28                     case R.id.button3:
29                     {text1.setText(s+"2");
30                     break;
31                     }
32                     }
33                 }
34 
35             };

tablelayout

 1 public class MainActivity extends Activity {
 2         private EditText edit1;
 3         private Button b1,b2,b3,b4,b5,b6;
 4     @Override
 5     public void onCreate(Bundle savedInstanceState) {
 6 
 7         super.onCreate(savedInstanceState);
 8         setContentView(R.layout.activity_main);
 9         edit1=(EditText)findViewById(R.id.editText1);
10         b1=(Button)findViewById(R.id.button1);
11         b2=(Button)findViewById(R.id.button2);
12         b3=(Button)findViewById(R.id.button3);
13         b4=(Button)findViewById(R.id.button4);
14         b5=(Button)findViewById(R.id.button5);
15         b6=(Button)findViewById(R.id.button6);
16      b1.setOnClickListener(listener);
17      b2.setOnClickListener(listener);
18      b3.setOnClickListener(listener);
19      b4.setOnClickListener(listener);
20      b5.setOnClickListener(listener);
21      b6.setOnClickListener(listener);
22 
23 
24     }       
25 
26     private Button.OnClickListener listener =new 
27             Button.OnClickListener() {
28 
29                 @Override
30                 public void onClick(View v) {
31                     // TODO Auto-generated method stub
32                     switch (v.getId()) {
33                     case R.id.button1:
34                         displayATM("1");
35                         break;
36                     case R.id.button2:
37                         displayATM("2");
38                         break;
39                     case R.id.button3:
40                         displayATM("3");
41                         break;
42                     case R.id.button4:
43                         displayATM("4");
44                         break;
45                     case R.id.button5:
46                         displayATM("5");
47                         break;
48                     case R.id.button6:
49                         displayATM("6");
50                         break;
51 
52                     default:
53                         break;
54                     }
55                 }
56             };
57             private void displayATM(String s){
58                 String str=edit1.getText().toString();
59                 edit1.setText(str+s);
60             }

这里写图片描述

**4.2**toast 弹出消息

 1 public void onCreate(Bundle savedInstanceState) {
 2 
 3         super.onCreate(savedInstanceState);
 4         setContentView(R.layout.activity_main);
 5         edit1=(EditText)findViewById(R.id.editText1);
 6         b1=(Button)findViewById(R.id.button1);
 7         b2=(Button)findViewById(R.id.button2);
 8         b3=(Button)findViewById(R.id.button3);
 9         b4=(Button)findViewById(R.id.button4);
10         b5=(Button)findViewById(R.id.button5);
11         b6=(Button)findViewById(R.id.button6);
12         b7=(Button)findViewById(R.id.button7);
13         b8=(Button)findViewById(R.id.button8);
14 
15      b1.setOnClickListener(listener);
16      b2.setOnClickListener(listener);
17      b3.setOnClickListener(listener);
18      b4.setOnClickListener(listener);
19      b5.setOnClickListener(listener);
20      b6.setOnClickListener(listener);
21      b7.setOnClickListener(listener);
22      b8.setOnClickListener(listener);
23 
24 
25 
26     }       
27 
28     private Button.OnClickListener listener =new 
29             Button.OnClickListener() {
30 
31                 @Override
32                 public void onClick(View v) {
33                     // TODO Auto-generated method stub
34                     switch (v.getId()) {
35                     case R.id.button1:
36                         displayATM("1");
37                         break;
38                     case R.id.button2:
39                         displayATM("2");
40                         break;
41                     case R.id.button3:
42                         displayATM("3");
43                         break;
44                     case R.id.button4:
45                         displayATM("4");
46                         break;
47                     case R.id.button5:
48                         displayATM("5");
49                         break;
50                     case R.id.button6:
51                         displayATM("6");
52                         break;
53                     case R.id.button7:{
54                         String str=edit1.getText().toString();
55                         if (str.length()>0){
56                             str=str.substring(0,str.length()-1);
57                             edit1.setText(str);
58                         }
59                     }
60                     case R.id.button8:{
61                          String str=edit1.getText().toString();
62                         if (str.equals("667788")){
63                             Toast toast =Toast.makeText(MainActivity.this, "密码正确，欢迎使用提款功能", Toast.LENGTH_LONG);
64                         toast.show();   
65                         }
66                         else{
67                             Toast toast =Toast.makeText(MainActivity.this, "密码错误，请重新输入", Toast.LENGTH_LONG);
68                             toast.show();
69                         }
70 
71                     }
72                     default:
73                         break;
74                     }
75                 }
76             };
77             private void displayATM(String s){
78                 String str=edit1.getText().toString();
79                 edit1.setText(str+s);
80             }

这里写图片描述

2)消息提示中央呈现

 1 case R.id.button8:{
 2                          String str=edit1.getText().toString();
 3                         if (str.equals("123456")){
 4                             Toast toast =Toast.makeText(MainActivity.this, "密码正确，欢迎使用提款功能", Toast.LENGTH_LONG);
 5                         toast.show();   
 6                         toast.setGravity(Gravity.CENTER, 0, 0);
 7                         }
 8                         else{
 9                             Toast toast =Toast.makeText(MainActivity.this, "密码错误，请重新输入", Toast.LENGTH_LONG);
10                             toast.show();
11                             toast.setGravity(Gravity.CENTER, 0, 0);
12 
13                         }
14 
15                     }

这里写图片描述

4.3 alertdialog对话框

1 case R.id.button9:{
2                         new AlertDialog.Builder(MainActivity.this)
3                         .setTitle("确认窗口")
4                         .setIcon(R.drawable.ic_launcher)
5                         .setMessage("确定要结束程序？")
6                         .show();
7                     }

这里写图片描述
2）加入交互按钮

 1 case R.id.button9:{
 2                         new AlertDialog.Builder(MainActivity.this)
 3                         .setTitle("确认窗口")
 4                         .setIcon(R.drawable.ic_launcher)
 5                         .setMessage("确定要结束程序？")
 6                         .setPositiveButton("确定", new  DialogInterface.OnClickListener() {
 7 
 8                             public void onClick(DialogInterface dialog, int which) {
 9 
10                                 finish();
11                             }
12                         })
13                         .setNegativeButton("取消", new  DialogInterface.OnClickListener() {
14 
15                             public void onClick(DialogInterface dialog, int which) {
16 
17 
18                             }
19                         })
20                         .show();
21                         break;
22                     }

这里写图片描述

一道练习题

  1 package com.twomeng.meng;
  2 
  3 import android.R.raw;
  4 import android.app.Activity;
  5 import android.app.AlertDialog;
  6 import android.content.DialogInterface;
  7 import android.location.GpsStatus.Listener;
  8 import android.os.Bundle;
  9 import android.view.View;
 10 import android.view.View.OnClickListener;
 11 import android.widget.Button;
 12 import android.widget.EditText;
 13 import android.view.Gravity;
 14 import android.view.Menu;
 15 import android.view.MenuItem;
 16 import android.widget.TextView;
 17 import android.widget.Toast;
 18 public class MainActivity extends Activity {
 19         private Button b1,b2,b3,b4;
 20     @Override
 21     public void onCreate(Bundle savedInstanceState) {
 22 
 23         super.onCreate(savedInstanceState);
 24         setContentView(R.layout.activity_main);
 25         b1=(Button)findViewById(R.id.button1);
 26         b2=(Button)findViewById(R.id.button2);
 27         b3=(Button)findViewById(R.id.button3);
 28         b4=(Button)findViewById(R.id.button4);
 29 
 30 b1.setOnClickListener(Listener);
 31 b2.setOnClickListener(Listener);
 32 b3.setOnClickListener(Listener);
 33 b4.setOnClickListener(Listener);
 34     }       
 35 
 36     private Button.OnClickListener Listener=
 37             new OnClickListener() {
 38 
 39                 @Override
 40                 public void onClick(View v) {
 41 
 42                     switch (v.getId()) {
 43                     case R.id.button1:
 44                         new AlertDialog.Builder(MainActivity.this)
 45                         .setTitle("确认窗口")
 46                         .setIcon(R.drawable.ic_launcher)
 47                         .setMessage("你按了button1，按确定关闭对话框")
 48                         .setPositiveButton("确定", new DialogInterface.OnClickListener() {
 49 
 50                             @Override
 51                             public void onClick(DialogInterface dialog, int which) {
 52                                 finish();
 53 
 54                             }
 55                         })
 56                         .show();
 57                         break;
 58                     case R.id.button2:new AlertDialog.Builder(MainActivity.this)
 59                     .setTitle("确认窗口")
 60                     .setIcon(R.drawable.ic_launcher)
 61                     .setMessage("你按了button2，按确定关闭对话框")
 62                     .setPositiveButton("确定", new DialogInterface.OnClickListener() {
 63 
 64                         @Override
 65                         public void onClick(DialogInterface dialog, int which) {
 66                             finish();
 67 
 68                         }
 69                     })
 70                     .show();
 71                         break;
 72                     case R.id.button3:
 73                         new AlertDialog.Builder(MainActivity.this)
 74                         .setTitle("确认窗口")
 75                         .setIcon(R.drawable.ic_launcher)
 76                         .setMessage("你按了button3，按确定关闭对话框")
 77                         .setPositiveButton("确定", new DialogInterface.OnClickListener() {
 78 
 79                             @Override
 80                             public void onClick(DialogInterface dialog, int which) {
 81                                 finish();
 82 
 83                             }
 84                         })
 85                         .show();
 86                         break;
 87 
 88                     case R.id.button4:
 89                         new AlertDialog.Builder(MainActivity.this)
 90                         .setTitle("确认窗口")
 91                         .setIcon(R.drawable.ic_launcher)
 92                         .setMessage("你按了button4，按确定关闭对话框")
 93                         .setPositiveButton("确定", new DialogInterface.OnClickListener() {
 94 
 95                             @Override
 96                             public void onClick(DialogInterface dialog, int which) {
 97                                 finish();
 98 
 99                             }
100                         })
101                         .show();
102                         break;
103                     }
104                 }
105             };
106 
107     @Override
108     public boolean onCreateOptionsMenu(Menu menu) {
109         // Inflate the menu; this adds items to the action bar if it is present.
110         getMenuInflater().inflate(R.menu.main, menu);
111         return true;
112     }
113 
114     @Override
115     public boolean onOptionsItemSelected(MenuItem item) {
116         // Handle action bar item clicks here. The action bar will
117         // automatically handle clicks on the Home/Up button, so long
118         // as you specify a parent activity in AndroidManifest.xml.
119         int id = item.getItemId();
120         if (id == R.id.action_settings) {
121             return true;
122         }
123         return super.onOptionsItemSelected(item);
124     }
125 }

这里写图片描述

第五章单选、复选和下拉列表

 1 private TextView text1;
 2     private CheckBox check1,check2,check3;
 3 
 4     public void onCreate(Bundle savedInstanceState) {
 5 
 6         super.onCreate(savedInstanceState);
 7         setContentView(R.layout.activity_main);
 8         text1=(TextView)findViewById(R.id.textView1);
 9         check1=(CheckBox)findViewById(R.id.check1);
10         check2=(CheckBox)findViewById(R.id.check2);
11         check3=(CheckBox)findViewById(R.id.check3);
12 
13         check1.setOnCheckedChangeListener(listener);
14         check2.setOnCheckedChangeListener(listener);
15         check3.setOnCheckedChangeListener(listener);
16 
17     }
18     private CheckBox.OnCheckedChangeListener listener =
19             new CheckBox.OnCheckedChangeListener() {
20 
21                 public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
22                 int n=0;
23                 String s="";
24                 String s1="",s2="",s3="";
25                 if (check1.isChecked()){
26                     n++;
27                     s1=check1.getText().toString()+" ";
28                 }
29                 else{
30                     s1="";
31                 }
32                 if (check2.isChecked()){
33                     n++;
34                     s2=check2.getText().toString()+" ";
35                 }
36                 else{
37                     s2="";
38                 }
39                 if (check3.isChecked()){
40                     n++;
41                     s3=check3.getText().toString()+" ";
42                 }
43                 else{
44                     s3="";
45                 }
46                 s=s1+s2+s3;
47                 text1.setText("最喜欢的球类有："+s+"共"+n+"项");
48 
49                 }
50             };

这里写图片描述

2）水平的复选框

 1 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     xmlns:tools="http://schemas.android.com/tools"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     android:orientation="vertical" >
 6 
 7     <TextView
 8         android:layout_width="fill_parent"
 9         android:layout_height="wrap_content"
10         android:text="我最喜欢的球类运动"
11         android:textSize="20sp" />
12 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
13     xmlns:tools="http://schemas.android.com/tools"
14     android:layout_width="wrap_content"
15     android:layout_height="wrap_content"
16     android:orientation="horizontal" >
17     <CheckBox
18         android:id="@+id/check1"
19         android:layout_width="fill_parent"
20         android:layout_height="wrap_content"
21         android:text="篮球"
22         android:textSize="20sp" />
23 
24     <CheckBox
25         android:id="@+id/check2"
26         android:layout_width="fill_parent"
27         android:layout_height="wrap_content"
28         android:text="足球"
29         android:textSize="20sp" />
30 
31     <CheckBox
32         android:id="@+id/check3"
33         android:layout_width="fill_parent"
34         android:layout_height="wrap_content"
35         android:text="棒球"
36         android:textSize="20sp" />
37 </LinearLayout>
38     <TextView
39         android:id="@+id/textView1"
40         android:layout_width="fill_parent"
41         android:layout_height="wrap_content"
42         android:text="显示消息"
43         android:textSize="20sp" />
44 
45 </LinearLayout>

这里写图片描述

5.2 radiobutton radiogroup单选列表

 1 private TextView text1;
 2     private RadioGroup group;
 3     private RadioButton button1,button2,button3;
 4     public void onCreate(Bundle savedInstanceState) {
 5         super.onCreate(savedInstanceState);
 6         setContentView(R.layout.activity_main);
 7         text1=(TextView)findViewById(R.id.textView1);
 8         group=(RadioGroup)findViewById(R.id.radioGroup1);
 9         button1=(RadioButton)findViewById(R.id.radio0);
10         button2=(RadioButton)findViewById(R.id.radio1);
11         button3=(RadioButton)findViewById(R.id.radio2);
12         group.setOnCheckedChangeListener(listener);
13 
14     }
15     private RadioGroup.OnCheckedChangeListener listener=
16             new RadioGroup.OnCheckedChangeListener() {
17 
18                 public void onCheckedChanged(RadioGroup group, int checkedId) {
19 int p=group.indexOfChild((RadioButton)findViewById(checkedId));
20 int count=group.getChildCount();
21 if(checkedId==R.id.radio0)
22     text1.setText(count+"项球类中，最喜欢第"+(p+1)+"项 "+button1.getText());
23 if(checkedId==R.id.radio1)
24     text1.setText(count+"项球类中，最喜欢第"+(p+1)+"项 "+button2.getText());
25 if(checkedId==R.id.radio2)
26     text1.setText(count+"项球类中，最喜欢第"+(p+1)+"项 "+button3.getText());
27                 }
28             };

2）水平单选框

 1 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     xmlns:tools="http://schemas.android.com/tools"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     android:orientation="vertical" >
 6 
 7     <TextView
 8         android:layout_width="fill_parent"
 9         android:layout_height="wrap_content"
10         android:text="我最喜欢的球类运动"
11         android:textSize="20sp" />
12 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
13     xmlns:tools="http://schemas.android.com/tools"
14     android:layout_width="wrap_content"
15     android:layout_height="wrap_content"
16     android:orientation="horizontal" >
17     <RadioGroup android:orientation="horizontal"
18         android:id="@+id/radioGroup1"
19         android:layout_width="fill_parent"
20         android:layout_height="wrap_content" >
21 
22         <RadioButton
23             android:id="@+id/radio0"
24             android:layout_width="fill_parent"
25             android:layout_height="wrap_content"
26             android:text="篮球" />
27 
28         <RadioButton
29             android:id="@+id/radio1"
30             android:text="足球"
31             android:layout_width="fill_parent"
32             android:layout_height="wrap_content"
33              />
34 
35         <RadioButton
36             android:id="@+id/radio2"
37             android:text="棒球"
38             android:layout_width="fill_parent"
39             android:layout_height="wrap_content"
40             />
41     </RadioGroup>
42 </LinearLayout>
43 
44     <TextView
45         android:id="@+id/textView1"
46         android:layout_width="fill_parent"
47         android:layout_height="wrap_content"
48         android:text="显示消息"
49         android:textSize="20sp" />
50 
51 </LinearLayout>

这里写图片描述

5.3 spinner 下拉式列表

package com.twomeng.meng;

import org.apache.http.conn.BasicEofSensorWatcher;

import android.R.raw;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.location.GpsStatus.Listener;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Adapter;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.Spinner;
import android.view.Gravity;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends Activity {

    private TextView text1;
    private Spinner spinner;
    String[] Balls=new String[]{"篮球","足球","棒球","其他"};
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        text1=(TextView)findViewById(R.id.textView1);
        spinner=(Spinner)findViewById(R.id.spinner1);

        spinner=(Spinner)findViewById(R.id.spinner1);
        ArrayAdapter<String> adapterballs=new ArrayAdapter<String>
        (this, android.R.layout.simple_spinner_item,Balls);

        adapterballs.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

        spinner.setAdapter(adapterballs);

        spinner.setOnItemSelectedListener(listener);
    }


            private Spinner.OnItemSelectedListener listener =
                    new Spinner.OnItemSelectedListener() {

                    public void onItemSelected(AdapterView<?> parent,View v,int position,long id ){
                        String string=parent.getSelectedItem().toString();
                        text1.setText(string);

                    }
                    public void onNothingSelected(AdapterView<?> parent ){

                        }
                    };

}

这里写图片描述

练习

 1 package com.twomeng.meng;
 2 
 3 import org.apache.http.conn.BasicEofSensorWatcher;
 4 
 5 import android.R.raw;
 6 import android.app.Activity;
 7 import android.app.AlertDialog;
 8 import android.content.DialogInterface;
 9 import android.location.GpsStatus.Listener;
10 import android.os.Bundle;
11 import android.view.View;
12 import android.view.View.OnClickListener;
13 import android.widget.Adapter;
14 import android.widget.AdapterView;
15 import android.widget.AdapterView.OnItemSelectedListener;
16 import android.widget.ArrayAdapter;
17 import android.widget.Button;
18 import android.widget.CheckBox;
19 import android.widget.CompoundButton;
20 import android.widget.CompoundButton.OnCheckedChangeListener;
21 import android.widget.EditText;
22 import android.widget.RadioButton;
23 import android.widget.RadioGroup;
24 import android.widget.Spinner;
25 import android.view.Gravity;
26 import android.view.Menu;
27 import android.view.MenuItem;
28 import android.widget.TextView;
29 import android.widget.Toast;
30 public class MainActivity extends Activity {
31 
32     private TextView textView;
33     private CheckBox check1,check2,check3;
34 
35 
36     public void onCreate(Bundle savedInstanceState) {
37         super.onCreate(savedInstanceState);
38         setContentView(R.layout.activity_main);
39         textView=(TextView)findViewById(R.id.textView2);
40         check1=(CheckBox)findViewById(R.id.checkBox1);
41         check2=(CheckBox)findViewById(R.id.checkBox2);
42         check3=(CheckBox)findViewById(R.id.checkBox3);
43 
44         check1.setOnCheckedChangeListener(listener);
45         check2.setOnCheckedChangeListener(listener);
46         check3.setOnCheckedChangeListener(listener);
47 
48     }
49     private CheckBox.OnCheckedChangeListener listener=
50             new OnCheckedChangeListener() {
51 
52                 @Override
53                 public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
54                     int n=0;
55                     String string;
56                     String s1,s2,s3;
57                     if (check1.isChecked()){
58                         n++;
59                         s1=check1.getText().toString();
60 
61                     }
62                     else
63                         s1=" ";
64                     if (check2.isChecked()){
65                         n++;
66                         s2=check2.getText().toString();
67 
68                     }
69                     else
70                         s2=" ";
71                     if (check3.isChecked()){
72                         n++;
73                         s3=check3.getText().toString();
74 
75                     }
76                     else
77                         s3=" ";
78 
79                     string=s1+s2+s3;
80                     textView.setText("最喜欢的程序语言有："+string+"共"+n+"种");
81                 }
82             };
83 
84 
85 
86 }

 1 package com.twomeng.meng;
 2 
 3 import org.apache.http.conn.BasicEofSensorWatcher;
 4 
 5 import android.R.raw;
 6 import android.app.Activity;
 7 import android.app.AlertDialog;
 8 import android.content.DialogInterface;
 9 import android.location.GpsStatus.Listener;
10 import android.os.Bundle;
11 import android.view.View;
12 import android.view.View.OnClickListener;
13 import android.widget.Adapter;
14 import android.widget.AdapterView;
15 import android.widget.AdapterView.OnItemSelectedListener;
16 import android.widget.ArrayAdapter;
17 import android.widget.Button;
18 import android.widget.CheckBox;
19 import android.widget.CompoundButton;
20 import android.widget.CompoundButton.OnCheckedChangeListener;
21 import android.widget.EditText;
22 import android.widget.RadioButton;
23 import android.widget.RadioGroup;
24 import android.widget.Spinner;
25 import android.view.Gravity;
26 import android.view.Menu;
27 import android.view.MenuItem;
28 import android.widget.TextView;
29 import android.widget.Toast;
30 public class MainActivity extends Activity {
31 
32     private TextView textView;
33     private RadioGroup group;
34     private RadioButton b1,b2,b3,b4;
35     private EditText editText;
36 
37     public void onCreate(Bundle savedInstanceState) {
38         super.onCreate(savedInstanceState);
39         setContentView(R.layout.activity_main);
40         textView=(TextView)findViewById(R.id.textView2);
41         editText=(EditText)findViewById(R.id.editText1);
42         b1=(RadioButton)findViewById(R.id.radio0);
43         b2=(RadioButton)findViewById(R.id.radio1);
44         b3=(RadioButton)findViewById(R.id.radio2);
45         b4=(RadioButton)findViewById(R.id.radio3);
46         group=(RadioGroup)findViewById(R.id.radioGroup1);
47         group.setOnCheckedChangeListener(listener);
48 
49     }
50     private RadioGroup.OnCheckedChangeListener listener=
51             new RadioGroup.OnCheckedChangeListener() {
52 
53                 public void onCheckedChanged(RadioGroup group, int checkedId) {
54                 if (checkedId==R.id.radio0){
55                     String string=editText.getText().toString();
56                     textView.setText(string+" 你的血型为 "+b1.getText());
57                 }
58                 if (checkedId==R.id.radio1){
59                     String string=editText.getText().toString();
60                     textView.setText(string+" 你的血型为 "+b2.getText());
61                 }
62                 if (checkedId==R.id.radio2){
63                     String string=editText.getText().toString();
64                     textView.setText(string+" 你的血型为 "+b3.getText());
65                 }
66                 if (checkedId==R.id.radio3){
67                     String string=editText.getText().toString();
68                     textView.setText(string+" 你的血型为 "+b4.getText());
69                 }
70                 }
71             };
72 
73 }

这里写图片描述

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原文地址：https://www.cnblogs.com/twomeng/p/9476210.html