Android基础之Android的Activity周期

直接上代码：

第一个类：TestActivity

package feb.hxy;import feb.hxy.R.string;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.widget.Button;public class TestActivity extends Activity {private Button button;public void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);System.out.println("TestActivity.onCreate");button = (Button) findViewById(R.id.anotherActivity);button.setText(string.anotherActivity);button.setOnClickListener(new Button.OnClickListener() {public void onClick(View v) {Intent intent = new Intent();intent.setClass(TestActivity.this, AnothorAcftivity.class);startActivity(intent);TestActivity.this.finish();}});}public void onStart() {System.out.println("TestActivity.onStart");super.onStart();}public void onResume() {System.out.println("TestActivity.onResume");super.onResume();}public void onPause() {System.out.println("TestActivity.onPause");super.onPause();}public void onStop() {System.out.println("TestActivity.onStop");super.onStop();}public void onDestroy() {System.out.println("TestActivity.onDestory");super.onDestroy();}public void onRestart() {System.out.println("TestActivity.onRestart");super.onRestart();}}

第二个类：AnothorAcftivity

package feb.hxy;import feb.hxy.R.string;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.widget.Button;public class AnothorAcftivity extends Activity {private Button button;public void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);System.out.println("AnothorAcftivity.onCreate");button = (Button) findViewById(R.id.anotherActivity);button.setText(string.back);button.setOnClickListener(new Button.OnClickListener() {public void onClick(View v) {Intent intent = new Intent();intent.setClass(AnothorAcftivity.this, TestActivity.class);startActivity(intent);//AnothorAcftivity.this.finish();}});}public void onStart() {System.out.println("AnothorAcftivity.onStart");super.onStart();}public void onResume() {System.out.println("AnothorAcftivity.onResume");super.onResume();}public void onPause() {System.out.println("AnothorAcftivity.onPause");super.onPause();}public void onStop() {System.out.println("AnothorAcftivity.onStop");super.onStop();}public void onDestroy() {System.out.println("AnothorAcftivity.onDestory");super.onDestroy();}public void onRestart() {System.out.println("AnothorAcftivity.onRestart");super.onRestart();}}

在模拟器中运行，查看DDMS，首先看到如下内容：

点击程序中的按钮，如下：

同样也点击第二个Activity中的按钮组件，如下：

注意：并没有调用到AnotherActivity的onDestroy()方法，因为AnotherActivity中注释了：

//AnothorAcftivity.this.finish();

由此可见当调用finish()时会调用onDestroy()。此时销毁Activity。

在点击模拟器上的返回键，结果如下：

此时调用了AnotherActivity的onRestart()方法。

去掉AnotherActivity中的注释，按照以上的执行步骤，运行结果如下：

完整代码下载：TestAndroid(注：本程序使用的是2.2的模拟器)

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