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" />