Android中activity跳转按钮事件的四种写法

public class MainActivity extends Activity { 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState); 
setContentView(R.layout.activity_main); 
// 方法1. 采用实现OnClickListener接口的类 
((Button) findViewById(R.id.btn1)) 
.setOnClickListener(new View.OnClickListener() { 
@Override 
public void onClick(View v) { 
Intent intent = new Intent(MainActivity.this, 
ButtonActivity1.class); 
startActivity(intent); 
} 
}); 
// 方法2. 采用匿名内部类 
((Button) findViewById(R.id.btn2)) 
.setOnClickListener(new View.OnClickListener() { 
@Override 
public void onClick(View v) { 
Intent intent = new Intent(MainActivity.this, 
ButtonActivity2.class); 
startActivity(intent); 
} 
}); 
// 方法3. Activity直接实现OnClickListener接口 
((Button) findViewById(R.id.btn3)) 
.setOnClickListener(new View.OnClickListener() { 
@Override 
public void onClick(View v) { 
Intent intent = new Intent(MainActivity.this, 
ButtonActivity3.class); 
MainActivity.this.startActivity(intent); 
} 
}); 
// 方法4.标签直接标注触发事件 
((Button) findViewById(R.id.btn4)) 
.setOnClickListener(new View.OnClickListener() { 
@Override 
public void onClick(View v) { 
Intent intent = new Intent(MainActivity.this, 
ButtonActivity4.class); 
MainActivity.this.startActivity(intent); 
} 
}); 
} 
@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
// Inflate the menu; this adds items to the action bar if it is present. 
getMenuInflater().inflate(R.menu.main, menu); 
return true; 
} 
@Override 
public boolean onOptionsItemSelected(MenuItem item) { 
// Handle action bar item clicks here. The action bar will 
// automatically handle clicks on the Home/Up button, so long 
// as you specify a parent activity in AndroidManifest.xml. 
int id = item.getItemId(); 
if (id == R.id.action_settings) { 
return true; 
} 
return super.onOptionsItemSelected(item); 
}

public class ButtonActivity1 extends Activity { 
Button button; 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState); 
setContentView(R.layout.activity_button1); 
button = (Button) findViewById(R.id.btn1); 
button.setOnClickListener(new MyListener()); 
} 
public class MyListener implements OnClickListener { 
@Override 
public void onClick(View v) { 
Toast.makeText(ButtonActivity1.this, "这是事件的第一种写法，内部类定义事件", 2000).show(); 
} 
} 
}

public class ButtonActivity2 extends Activity { 
Button button ; 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState); 
setContentView(R.layout.activity_button2); 
button = (Button)findViewById(R.id.btn1); 
button.setOnClickListener(new View.OnClickListener() { 
@Override 
public void onClick(View v) { 
Toast.makeText(ButtonActivity2.this, "这是事件的第二种写法，匿名内部类的形式", 2000).show(); 
} 
}); 
} 
}

public class ButtonActivity3 extends Activity implements OnClickListener { 
Button button; 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState); 
setContentView(R.layout.activity_button3); 
button= (Button)findViewById(R.id.btn1); 
button.setOnClickListener(this); 
} 
@Override 
public void onClick(View v) { 
switch (v.getId()) { 
case R.id.btn1: 
Toast.makeText(ButtonActivity3.this, 
"这是事件的第三种写法，直接实现OnClickListener接口的OnClick方法", 2000).show(); 
break; 
default: 
Toast.makeText(ButtonActivity3.this, "没有触发", 2000).show(); 
break; 
} 
} 
}

<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" 
tools:context="com.example.test.Button4Activity" > 
<Button 
android:id="@+id/btn4" 
android:layout_width="match_parent" 
android:layout_height="wrap_content" 
android:text="点击我" 
android:onClick="btnClickEvent"/> 
</LinearLayout> 
public class ButtonActivity4 extends Activity { 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState); 
setContentView(R.layout.activity_button4); 
} 
public void btnClickEvent(View v){ 
Toast.makeText(ButtonActivity4.this, "这是事件的第四种写法，直接在布局文件的Button标签上绑定Click事件", 2000).show(); 
} 
}

<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" 
android:paddingBottom="@dimen/activity_vertical_margin" 
android:paddingLeft="@dimen/activity_horizontal_margin" 
android:paddingRight="@dimen/activity_horizontal_margin" 
android:paddingTop="@dimen/activity_vertical_margin" 
tools:context="com.example.test.MainActivity" > 
<Button 
android:id="@+id/btn1" 
android:layout_width="match_parent" 
android:layout_height="wrap_content" 
android:text="@string/clickMe1" /> 
<Button 
android:id="@+id/btn2" 
android:layout_width="match_parent" 
android:layout_height="wrap_content" 
android:text="@string/clickMe2" /> 
<Button 
android:id="@+id/btn3" 
android:layout_width="match_parent" 
android:layout_height="wrap_content" 
android:text="@string/clickMe3" /> 
<Button 
android:id="@+id/btn4" 
android:layout_width="match_parent" 
android:layout_height="wrap_content" 
android:text="@string/clickMe4" 
android:onClick="btnClickEvent"/> 
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
package="com.example.test" 
android:versionCode="1" 
android:versionName="1.0" > 
<uses-sdk 
android:minSdkVersion="14" 
android:targetSdkVersion="14" /> 
<uses-permission android:name="android.permission.CALL_PHONE" /> 
<uses-permission android:name="android.permission.INTERNET" /> 
<application 
android:allowBackup="true" 
android:icon="@drawable/ic_launcher" 
android:label="@string/app_name" 
android:theme="@style/AppTheme" > 
<activity 
android:name=".MainActivity" 
android:label="@string/app_name" > 
<intent-filter> 
<action android:name="android.intent.action.MAIN" /> 
<category android:name="android.intent.category.LAUNCHER" /> 
</intent-filter> 
</activity> 
<activity 
android:name=".ButtonActivity1" 
android:label="@string/button1" /> 
<activity 
android:name=".ButtonActivity2" 
android:label="@string/button2" /> 
<activity 
android:name=".ButtonActivity3" 
android:label="@string/button3" /> 
<activity 
android:name=".ButtonActivity4" 
android:label="@string/button4" /> 
</application> 
</manifest>

<action android:name="android.intent.action.MAIN" />

<?xml version="1.0" encoding="utf-8"?> 
<resources> 
<string name="app_name">test</string> 
<string name="hello_world">Hello world!</string> 
<string name="action_settings">Settings</string> 
<string name="clickMe1">按钮事件1</string> 
<string name="clickMe2">按钮事件2</string> 
<string name="clickMe3">按钮事件3</string> 
<string name="clickMe4">按钮事件4</string> 
<string name="button1">按钮1</string> 
<string name="button2">按钮2</string> 
<string name="button3">按钮3</string> 
<string name="button4">按钮4</string> 
</resources>