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" />