有关Botton的用法（二）

关于设置listener监听onClicked事件的步骤分析

Steps:

1.tell android you are interested in listening to a button click

2.bring your xml button inside java

3.tell your java button whose responding when it's clicked

4.what should happen when button is clicked

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Button1"
        android:id="@+id/button1"
        android:layout_below="@+id/textView"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true" />

public class MainActivity extends Activity implements OnClickListener {//1.tell android you are interested in listening to a button click

    Button button;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        button = (Button)findViewById(R.id.button1);//2.bring your xml button inside java
        button.setOnClickListener(this);//3.tell your java button whose responding when it's clicked
    }

    @Override//4.what should happen when button is clicked
    public void onClick(View v) {
        Log.e("MainActivity","Clicked1");
    }

}

 监听多个button：

        button1 = (Button)findViewById(R.id.button1);
        button1.setOnClickListener(this);
        button2 = (Button)findViewById(R.id.button2);
        button2.setOnClickListener(this);
        button3 = (Button)findViewById(R.id.button3);
        button3.setOnClickListener(this);

@Override
    public void onClick(View view) {
        if(view.getId()==R.id.button1){//复制
            TextView textView = (TextView)findViewById(R.id.textView);
            TextView textView1 = (TextView)findViewById(R.id.editText);
            textView.setText(""+textView1.getText());

        }
        if(view.getId()==R.id.button2){//锁定
            TextView textView = (TextView)findViewById(R.id.editText);
            //textView.setFocusable(false);
            //textView.setFocusableInTouchMode(false);
            //textView.setEnabled(false);
            keyListener=textView.getKeyListener();
            textView.setKeyListener(null);
            InputMethodManager imm = (InputMethodManager)getSystemService(INPUT_METHOD_SERVICE);//这两行是收起软键盘
            imm.hideSoftInputFromWindow(textView.getWindowToken(),0);

        }
        if(view.getId()==R.id.button3){//编辑
            TextView textView = (TextView)findViewById(R.id.editText);
            textView.setKeyListener(keyListener);
            textView.setFocusable(true);
            textView.setFocusableInTouchMode(true);
            textView.requestFocus();

        }
  }

布局如下：

<TextView
          android:text="@string/hello_world"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:id="@+id/textView" />

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

      <Button
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:text="锁定"
          android:id="@+id/button2"
          android:layout_alignParentLeft="true"
          android:layout_alignParentStart="true" />

      <Button
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:text="编辑"
          android:id="@+id/button3"
          android:layout_centerHorizontal="true" />