慕课网-安卓攻城狮视频学习及练习（三）

arrayadapter+simpleadapter

public class MainActivity extends Activity  {

    private ListView list;//视图，即为电视屏幕
    private ArrayAdapter<String> arradapter;//数据适配器，适用于数组+集合，即为无线
    private SimpleAdapter simadapter;
    private List<Map<String, Object>> datalist;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        list =(ListView)findViewById(R.id.listView1);//数组形式的数据源，即为电视台
    //1.新建一个数据适配器
//.SimpleAdapter(Context context, List<? extends Map<String, ?>> data, int resource, String[] from, int[] to)
    //2.适配器加载适配源
    String [] arrdata={"mook1","i","like","u"};
    arradapter=new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, arrdata);

    datalist=new ArrayList<Map<String,Object>>();
    simadapter=new SimpleAdapter(this, getdata(), R.layout.item, new String[]{"pic","text"}, new int[]{R.id.pic,R.id.text});
        //3.视图加载适配器
        //list.setAdapter(arradapter);
        list.setAdapter(simadapter);

    }
    private List<Map<String, Object>> getdata(){
        for (int i=0;i<20;i++){
            Map<String , Object> map=new HashMap<String, Object>();
            map.put("pic", R.drawable.ic_launcher);
            map.put("text", "mook"+i);
            datalist.add(map);
        }
        return datalist;
    }

}

spinner

public class MainActivity extends Activity  {
   private TextView text1,text2,text3;
   private EditText edit;
   private Spinner spin;
   private ArrayAdapter<String> arr_adapter;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        text1=(TextView)findViewById(R.id.textView1);
        text2=(TextView)findViewById(R.id.textView2);
        text3=(TextView)findViewById(R.id.textView3);


        spin=(Spinner)findViewById(R.id.spinner);
        edit=(EditText)findViewById(R.id.editText1);

        //1、新建适配器 2、适配器加载数据源 3、视图加载适配器
        String[] data=new String[]{"小学","初中","高中","本科","研究生"};
        arr_adapter=new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, data);
        arr_adapter.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line);
        spin.setAdapter(arr_adapter);

        spin.setOnItemSelectedListener(listener);


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

                @Override
                public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                    // TODO Auto-generated method stub
                     String s1=edit.getText().toString();
                     String s2=spin.getSelectedItem().toString();

                     text3.setText(s1+"的学历："+s2);
                }

                @Override
                public void onNothingSelected(AdapterView<?> parent) {
                    // TODO Auto-generated method stub

                }
            };


}

Android攻城狮的第一门课（入门篇）
第5章 认识按钮Button以及ImageButton
text属性内容放置在value-string.xml中

加注释快捷键：
ctrl+/ //注释
ctrl+shift+/ /**/注释

监听三种：

public class MainActivity extends Activity implements OnClickListener{


    private Button btn;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        btn=(Button)findViewById(R.id.button1);
        /*监听的三种方式
         * 1、匿名内部类
         * 2、外部类
         * 3.接口
        */

    /* 1
     * btn.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO 自动生成的方法存根
            Log.i("tag", "匿名内部类");
            //Toast.makeText(MainActivity.this, "匿名", Toast.LENGTH_LONG);
    }
    });*/

        //btn.setOnClickListener(listener);
        btn.setOnClickListener(this);
    }
    /*2
     * OnClickListener listener =new OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO 自动生成的方法存根
            Log.i("tag", "匿名内部类");
            Toast.makeText(MainActivity.this, "匿名", Toast.LENGTH_LONG);
        }
    };*/
    @Override
    public void onClick(View v) {
        // TODO 自动生成的方法存根
        Log.i("tag", "匿名内部类");

    }








}

textview实现跑马灯效果

<com.example.meng.marqueettext
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:singleLine="true"//单行
        android:ellipsize="marquee"//去掉省略号
        android:focusable="true"//使其循环
        android:marqueeRepeatLimit="marquee_forever"
        //无限制循环
        android:focusableInTouchMode="true"
        android:text="@string/text_name"/>


    <com.example.meng.marqueettext
        android:id="@+id/textView1"
        android:layout_marginTop="10dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:singleLine="true"
        android:ellipsize="marquee"
        android:focusable="true"
        android:marqueeRepeatLimit="marquee_forever"
        android:focusableInTouchMode="true"
        android:text="@string/text_name"/>

step1：textview增加若干属性,即可实现一个textview的跑马灯效果
step2 : 复制一个textview，两个的情况下必须建立新的类marquee，继承textview，三个构造方法+isfucused方法return TRUE
step3：包名+类名代替textview

动态匹配功能：显示的下拉列表，使用arrayadapter

private AutoCompleteTextView act;
    private ArrayAdapter<String> arr_adapter;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        act=(AutoCompleteTextView) findViewById(R.id.autoCompleteTextView1);
        String[] resource={"beijing1","beijing2","beijing3","shanghai1","shanghai2"};
        arr_adapter =new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, 
                resource);
        act.setAdapter(arr_adapter);
    }

注意两条属性：
提示
输入几个字母开始提示

 android:hint="请输入你要搜索的关键词"
        android:completionThreshold="3" 

与autocompletetextview不同的是，可以用逗号作为分隔符，进行多选。

private ArrayAdapter<String> arr_adapter;
    private MultiAutoCompleteTextView mct;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mct=(MultiAutoCompleteTextView) findViewById(R.id.multiAutoCompleteTextView1);


        String[] resource={"beijing1","beijing2","beijing3","shanghai1","shanghai2"};
        arr_adapter =new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, 
                resource);

        mct.setAdapter(arr_adapter);
mct.setTokenizer(new MultiAutoCompleteTextView.CommaTokenizer());

    }

private ToggleButton tb;
    private ImageView iv;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        tb=(ToggleButton) findViewById(R.id.toggleButton1);
        iv=(ImageView) findViewById(R.id.imageView3);

        tb.setOnCheckedChangeListener(this);
    }
    @Override
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        //当tb被点击时，执行当前的方法
        //第一个参数检测是哪个tb被点击了，第二个参数判断当前tb的状态
        iv.setBackgroundResource(isChecked?R.drawable.open:R.drawable.close);

    }

private CheckBox cb;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        cb=(CheckBox) findViewById(R.id.checkBox1);
        cb.setOnCheckedChangeListener(new OnCheckedChangeListener() {

            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                // 匿名内部类实现监听，通过该方法来监听CheckBox是否被选中
                //ischecked参数可以判断当前的cb是否被选中
                if (isChecked) {
            String text=        cb.getText().toString();
            Log.i("tag", text);//在控制台的日志中显示text
                }

            }
        });

public class MainActivity extends Activity implements  android.widget.RadioGroup.OnCheckedChangeListener {

    private RadioGroup rg;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    rg=(RadioGroup) findViewById(R.id.radioGroup1); 
    rg.setOnCheckedChangeListener(this);


    }

    @Override
    public void onCheckedChanged(RadioGroup group, int checkedId) {
        switch (checkedId) {
        case R.id.radio1:
            Log.i("tag", "men");
            break;
        case R.id.radio2:
            Log.i("tag", "women");
            break;
        default:
            break;
        }

    }



}

使用接口时，继承的是android.widget.RadioGroup.OnCheckedChangeListener
若直接写oncheckedchangelistener,必须要导入对应的包。
radiogroup是单选，可以用switch语句

gravity决定其子类控件的属性
写在线性布局中。

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="bottom|center_horizontal"
     >

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Button" />

</LinearLayout>

layout_gravity决定的是当前父类控件的位置。

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"

     >

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Button" 
        android:layout_gravity="center_horizontal|center"/>

</LinearLayout>

界面的布局，往往需要两种属性共同控制，父类和子类。
如果父类和子类中的某些属性相悖，当然是听爸爸的啦~

layout_weight 子类控件在父类控件中所占比例。

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
     >

    <Button
        android:id="@+id/button2"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Button"
        android:layout_weight="1" />

    <Button
        android:id="@+id/button1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Button" 
        android:layout_weight="1"
       />

</LinearLayout>