请问大神，关于Activity不能完全finish的问题

sulinly 2018-01-12 04:23:26

MainActivity 启动服务后台服务后执行Finnish，将MainActivity停止，见代码1。执行后MainActivity界面的确不见了，按手机多任务键（有的手机是长按home键）检查，多任务里该程序不见了，后台服务也能正常运行。此时按多任务键界面里的全部关闭程序，所有多任务程序被关闭掉，但后台程序依然能正常运行。

问题：如果将finish放到MainActivity的buton中执行，见代码2。按钮执行后MainActivity界面的确不见了，但是按手机多任务键检查，多任务里该程序依然存在。此时按多任务键界面里的全部关闭程序，所有多任务程序被关闭掉，同时后台程序同时被关闭。为何将finish放到按钮中执行就不正常了，咋个解决呢？

代码1：

public class MainActivity extends AppCompatActivity {

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        //启动服务

        Intent i1 = new Intent(this, MyService.class);

        startService(i1);

        finish();

    }

}

代码2：

public class MainActivity extends AppCompatActivity {

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        //启动服务

        Intent i1 = new Intent(this, MyService.class);

        startService(i1);

//        finish();

        setContentView(R.layout.activity1);

        findViewById(R.id.btn_hide).setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                finish();

            }

        });



    }

}

手机的多任务界面：

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sulinly 2018-01-16

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引用 2 楼 usecf 的回复:

打印下log adb logcat 看看报什么错误或者异常

发现不通过按钮的finish的确有报错，应该是报错引起的任务清单里没有该程序吧。谢谢大神，我在想是不是可以用这个bug做个保活程序呢？ 01-16 23:39:26.723 25313-25313/com.sugem.autoweb E/AndroidRuntime: FATAL EXCEPTION: main Process: com.sugem.autoweb, PID: 25313 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.sugem.autoweb/com.sugem.autoweb.MainActivity}: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity. at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2735) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2796) at android.app.ActivityThread.-wrap12(ActivityThread.java) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1521) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:154) at android.app.ActivityThread.main(ActivityThread.java:6265) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:906) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:796) Caused by: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity. at android.support.v7.app.AppCompatDelegateImplV9.createSubDecor(AppCompatDelegateImplV9.java:354) at android.support.v7.app.AppCompatDelegateImplV9.ensureSubDecor(AppCompatDelegateImplV9.java:323) at android.support.v7.app.AppCompatDelegateImplV9.findViewById(AppCompatDelegateImplV9.java:233) at android.support.v7.app.AppCompatActivity.findViewById(AppCompatActivity.java:190) at com.sugem.autoweb.MainActivity.onCreate(MainActivity.java:48) at android.app.Activity.performCreate(Activity.java:6774) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1125) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2688) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2796) at android.app.ActivityThread.-wrap12(ActivityThread.java) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1521) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:154) at android.app.ActivityThread.main(ActivityThread.java:6265) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:906) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:796)

sulinly 2018-01-16