Android開發之onClick事件的三種寫法

<pre class="java" name="code">package com.example.hellp;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class AActivity extends Activity {
	/** Called when the activity is first created. */

	EditText Ev1;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);

		Ev1 = (EditText)findViewById(R.id.editText1);  

		//第一種方式  
		Button Btn1 = (Button)findViewById(R.id.button1);//獲取按鈕資源  
		Btn1.setOnClickListener(new Button.OnClickListener(){//創建監聽  
			public void onClick(View v) {  
				String strTmp = "點擊Button01";  
				Ev1.setText(strTmp);  
			}  

		});  

		//第二種方式  
		Button Btn2 = (Button) findViewById(R.id.button2);//獲取按鈕資源  
		Btn2.setOnClickListener(listener);//設置監聽  

	}

	Button.OnClickListener listener = new Button.OnClickListener(){//創建監聽對象  
		public void onClick(View v){  
			String strTmp="點擊Button02";  
			Ev1.setText(strTmp);  
		}  

	};


	//第三種方式(Android1.6版本及以後的版本中提供了)  
	public void Btn3OnClick(View view){  
		String strTmp="點擊Button03";
		Ev1.setText(strTmp);

	}  
}

package com.example.hello;import android.os.Bundle;import android.support.v7.app.ActionBarActivity;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.widget.Button;import android.widget.Toast;public class MainActivity extends ActionBarActivity {private Button mButton1;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);mButton1=(Button) findViewById(R.id.btn2);mButton1.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubToast.makeText(getApplicationContext(), "This is ButtonNew匿名內部類...",Toast.LENGTH_SHORT).show();}});}public void onBTN(View v) {// TODO Auto-generated method stubToast.makeText(getApplicationContext(), "This is myButton...",Toast.LENGTH_SHORT).show();}@Overridepublic 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;}@Overridepublic 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);}}