常用控件

1. CheckBox（复选框）

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        checkBox = (CheckBox) findViewById(R.id.checkbox_id);
        checkBox.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if(checkBox.isChecked())
                    Toast.makeText(MainActivity.this,"CheckBox选中", Toast.LENGTH_SHORT).show();
                else
                    Toast.makeText(MainActivity.this,"CheckBox未选中", Toast.LENGTH_SHORT).show();
            }
        });
    }

2. RadioGroup/RadioButton（单选按钮）

参考：https://www.cnblogs.com/wt616/archive/2011/06/20/2085531.html

RadioButton表示单个圆形单选框，而RadioGroup是可以容纳多个RadioButton的容器

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        radioGroup = findViewById(R.id.radioGroup_id);
        radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup radioGroup, int i) {
                RadioButton radbtn = (RadioButton) findViewById(i);
                Toast.makeText(getApplicationContext(), "按钮组值发生改变,你选了" + radbtn.getText(), Toast.LENGTH_LONG).show();
            }
        });
    }

3. SeekBar（拖动条）

参考资料：http://www.runoob.com/w3cnote/android-tutorial-seekbar.html

<SeekBar
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:max="100"
        android:progress="50"
        android:id="@+id/seekbar_id"
        />

 protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        seekBar = findViewById(R.id.seekbar_id);
        tv = findViewById(R.id.textView_id);
        seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            @Override
            public void onProgressChanged(SeekBar seekBar, int progress, boolean b) {
                tv.setText("当前进度值：" + progress + "/100 ");
            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {
                Toast.makeText(MainActivity.this, "触碰SeekBar", Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {
                Toast.makeText(MainActivity.this, "放开SeekBar", Toast.LENGTH_SHORT).show();
            }
        });
    }

 

4. ScrollView（滚动条）

参考资料：http://www.runoob.com/w3cnote/android-tutorial-scrollview.html

 注意：ScrollView是FrameLayout的子类，并不是widget控件的子类，并不是控件，是Framlayout容器，只是功能类似控件，放到这里

java.lang.Object
   android.view.View
       android.view.ViewGroup
           android.widget.FrameLayout
               android.widget.ScrollView

<Button
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/scrollButtonup_id"
            android:text="上"/>
<Button
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/scrollButtondown_id"
            android:text="下"/>
    
<ScrollView
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:id="@+id/scrollView_id">

        <TextView
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:id="@+id/textView_id"/>
</ScrollView>

{
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        tv = (TextView) findViewById(R.id.textView_id);
        sl = (ScrollView) findViewById(R.id.scrollView_id);
        down = (Button) findViewById(R.id.scrollButtondown_id);
        up = (Button)findViewById(R.id.scrollButtonup_id);

        StringBuilder str1 = new StringBuilder();
        for(int ii=0; ii<100; ii++){
            str1.append("ceshi"+ii+"
");
        }
        tv.setText(str1.toString());
        up.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                sl.fullScroll(View.FOCUS_UP );
            }
        });
        down.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                sl.fullScroll(View.FOCUS_DOWN );
            }
        });

    }

5. AlertDialog（对话框）

public class MainActivity extends Activity implements View.OnClickListener{
    Button bt_normal;
    Button bt_single;
    Button bt_multi;
    Button bt_speed;

    AlertDialog alertDialog;
    AlertDialog.Builder builder;
    Context context;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        bt_normal = (Button) findViewById(R.id.normal_id);
        bt_single = (Button) findViewById(R.id.single_id);
        bt_multi = (Button) findViewById(R.id.multi_id);
        bt_speed = (Button) findViewById(R.id.speed_id);

        bt_normal.setOnClickListener(this);
        bt_single.setOnClickListener(this);
        bt_multi.setOnClickListener(this);
        bt_speed.setOnClickListener(this);

        context = MainActivity.this;
    }
    //多选框的两个参数
    String[] str1 = {"小李", "小张", "小王", "小陈", "小丽"};
    boolean[] bool1 = {true,false, true, false, true};

    @Override
    public void onClick(View v) {
        switch (v.getId()){
            case R.id.normal_id:

                builder = new AlertDialog.Builder(context);
                builder.setTitle("普通对话框的标题");
                builder.setMessage("普通对话框的信息");
                builder.setPositiveButton("确认键", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        Toast.makeText(context, "你已选择确定键", Toast.LENGTH_SHORT).show();
                    }
                });

                builder.setNegativeButton("取消键", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        Toast.makeText(context, "你已选择取消键", Toast.LENGTH_SHORT).show();
                    }
                });
                builder.show();
            break;

            case R.id.single_id:
                final String[] str = {"北京", "上海", "深圳", "台北", "长沙"};
                builder = new AlertDialog.Builder(context);
                builder.setSingleChoiceItems(str, 2, new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        Toast.makeText(context, "你选择了"+str[which], Toast.LENGTH_SHORT).show();
                    }
                });
                builder.show();
                break;
            case R.id.multi_id:

                builder = new AlertDialog.Builder(context);
                builder.setMultiChoiceItems(str1, bool1, new OnMultiChoiceClickListener() {

                    @Override
                    public void onClick(DialogInterface dialog, int which, boolean isChecked) {
                        if(isChecked==true)
                            Toast.makeText(context, "你选择了"+str1[which], Toast.LENGTH_SHORT).show();
                        else
                            Toast.makeText(context, "你取消了"+str1[which], Toast.LENGTH_SHORT).show();
                    }
                });
                builder.show();
                break;
            case R.id.speed_id:
                final ProgressDialog dialog = ProgressDialog.show(this, null, "姐们,正在拼命 加载中....");
                //让 在子线程中睡    3 秒钟
                new Thread(){
                    public void run() {
                        SystemClock.sleep(3000);
                        dialog.dismiss();
                        Log.d("MainActivity", "子线程");
                    };
                }.start();
                Log.d("MainActivity", "主线程");
                break;
        }
        Log.d("MainActivity", "onClick after");
    }
}

普通对话框

 

单选框

 

多选框

 

进度