1，在Activity中實現Activity的宣告週期方法。

onCreate()

onDestroy()

2，繼承Application實現自定義生命週期管理

import java.util.Stack;

import android.app.Activity;
import android.app.Application;

public class MyApplication extends Application{
	private static Stack<Activity> activityStack;
    private static MyApplication singleton;
    @Override
    public void onCreate()
    {
        super.onCreate();
        singleton=this;
    }
    // Returns the application instance
    public static MyApplication getInstance() {
        return singleton;
    }

    /**
     * add Activity 新增Activity到棧
     */
    public void addActivity(Activity activity){
        if(activityStack ==null){
            activityStack =new Stack<Activity>();
        }
        activityStack.add(activity);
    }
    /**
     * get current Activity 獲取當前Activity（棧中最後一個壓入的）
     */
    public Activity currentActivity() {
        Activity activity = activityStack.lastElement();
        return activity;
    }
    /**
     * 結束當前Activity（棧中最後一個壓入的）
     */
    public void finishActivity() {
        Activity activity = activityStack.lastElement();
        finishActivity(activity);
    }

    /**
     * 結束指定的Activity
     */
    public void finishActivity(Activity activity) {
        if (activity != null) {
            activityStack.remove(activity);
            activity.finish();
            activity = null;
        }
    }

    /**
     * 結束指定類名的Activity
     */
    public void finishActivity(Class<?> cls) {
        for (Activity activity : activityStack) {
            if (activity.getClass().equals(cls)) {
                finishActivity(activity);
            }
        }
    }

    /**
     * 結束所有Activity
     */
    public void finishAllActivity() {
        for (int i = 0, size = activityStack.size(); i < size; i++) {
            if (null != activityStack.get(i)) {
                activityStack.get(i).finish();
            }
        }
        activityStack.clear();
    }

    /**
     * 退出應用程式
     */
    public void AppExit() {
        try {
            finishAllActivity();
        } catch (Exception e) {
        }
    }
}
 

 <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
       <span style="color:#FF0000;"><strong> android:name="com.example.zxingdemo.MyApplication"</strong></span>
        android:theme="@android:style/Theme.NoTitleBar" >
 

</pre><pre name="code" class="java">public class MainActivity2 extends Activity {

	TextView textView6, textView7, textView8, textView9;
	Button button;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		<span style="color:#FF6666;"><strong>MyApplication.getInstance().addActivity(this);</strong></span>
		setContentView(R.layout.permanent);
		textView6 = (TextView) findViewById(R.id.textView6);
		textView7 = (TextView) findViewById(R.id.textView7);
		textView8 = (TextView) findViewById(R.id.textView8);
		textView9 = (TextView) findViewById(R.id.textView9);
		Bundle bundle = this.getIntent().getExtras();
		button.setOnClickListener(new View.OnClickListener() {

			@Override
			public void onClick(View v) {
				Intent intent = new Intent(MainActivity2.this,
						MainActivity.class);
				startActivity(intent);
			}
		});
	}

	@Override
	protected void onDestroy() {
		super.onDestroy();
		<span style="color:#FF0000;"><strong>MyApplication.getInstance().finishActivity(this);</strong></span>
	}
}