java - 不幸的是，App已停止(Android开发)

Question

我刚开始android开发两天，这是我无法解决的错误“不幸的是，[App]已停止”。

这就是我打算用该应用程序做的事情。

1. 显示 UI，告诉用户按“确定”后，应用程序将开始创建日志文件。

2. 按下“确定”按钮后，它将在后台运行(不需要 UI)并等待其他应用程序的通知，并将通知中的文本写入日志文件。

这是我的 AndroidManifest

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.notificationnotifier"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="16"
        android:targetSdkVersion="17" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.notificationnotifier.GetNotification"
            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="com.example.notificationnotifier.MonitorNotification"
            android:label="@string/app_name" android:exported="false">

            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </activity>

    </application>

</manifest>

这是 GetNotification.java

public class GetNotification extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_get_notification);

        Button okButton = (Button) findViewById(R.id.OKButton);
        okButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                Intent getNotification = new Intent("com.example.notificationnotifier.MonitorNotification");
                startActivity(getNotification); 
            }
        }) ;

        Button cancel = (Button) findViewById(R.id.Cancel);
        cancel.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                finish();
            }
        }) ;

    }

    @Override
    protected void onDestroy() {
        // TODO Auto-generated method stub
        super.onDestroy();
    }

    @Override
    protected void onPause() {
        // TODO Auto-generated method stub
        super.onPause();
    }

    @Override
    protected void onStart() {
        // TODO Auto-generated method stub
        super.onStart();
    }

    @Override
    protected void onStop() {
        // TODO Auto-generated method stub
        super.onStop();
    }  
}

这是MonitorNotification.java

import android.accessibilityservice.AccessibilityService;
import android.accessibilityservice.AccessibilityServiceInfo;
import android.view.accessibility.AccessibilityEvent;

public class MonitorNotification extends AccessibilityService{

    @Override
    public void onAccessibilityEvent(AccessibilityEvent arg0) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onInterrupt() {
        // TODO Auto-generated method stub

    }

    @Override
    protected void onServiceConnected() {
        // TODO Auto-generated method stub
    //  super.onServiceConnected();
        AccessibilityServiceInfo info = new AccessibilityServiceInfo();
          info.feedbackType = 1;
              info.eventTypes = AccessibilityEvent.TYPE_NOTIFICATION_STATE_CHANGED;
          info.notificationTimeout = 100; 
          setServiceInfo(info);
    }
}

这是日志猫 [更新]

02-04 10:31:17.947: E/Trace(1108): error opening trace file: No such file or directory (2)
02-04 10:31:18.648: D/gralloc_goldfish(1108): Emulator without GPU emulation detected.
02-04 10:31:21.128: D/AndroidRuntime(1108): Shutting down VM
02-04 10:31:21.148: W/dalvikvm(1108): threadid=1: thread exiting with uncaught exception (group=0x40a13300)
02-04 10:31:21.169: E/AndroidRuntime(1108): FATAL EXCEPTION: main
02-04 10:31:21.169: E/AndroidRuntime(1108): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.notificationnotifier/com.example.notificationnotifier.MonitorNotification}: java.lang.ClassCastException: com.example.notificationnotifier.MonitorNotification cannot be cast to android.app.Activity
02-04 10:31:21.169: E/AndroidRuntime(1108):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1983)
02-04 10:31:21.169: E/AndroidRuntime(1108):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
02-04 10:31:21.169: E/AndroidRuntime(1108):     at android.app.ActivityThread.access$600(ActivityThread.java:130)
02-04 10:31:21.169: E/AndroidRuntime(1108):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
02-04 10:31:21.169: E/AndroidRuntime(1108):     at android.os.Handler.dispatchMessage(Handler.java:99)
02-04 10:31:21.169: E/AndroidRuntime(1108):     at android.os.Looper.loop(Looper.java:137)
02-04 10:31:21.169: E/AndroidRuntime(1108):     at android.app.ActivityThread.main(ActivityThread.java:4745)
02-04 10:31:21.169: E/AndroidRuntime(1108):     at java.lang.reflect.Method.invokeNative(Native Method)
02-04 10:31:21.169: E/AndroidRuntime(1108):     at java.lang.reflect.Method.invoke(Method.java:511)
02-04 10:31:21.169: E/AndroidRuntime(1108):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
02-04 10:31:21.169: E/AndroidRuntime(1108):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
02-04 10:31:21.169: E/AndroidRuntime(1108):     at dalvik.system.NativeStart.main(Native Method)
02-04 10:31:21.169: E/AndroidRuntime(1108): Caused by: java.lang.ClassCastException: com.example.notificationnotifier.MonitorNotification cannot be cast to android.app.Activity
02-04 10:31:21.169: E/AndroidRuntime(1108):     at android.app.Instrumentation.newActivity(Instrumentation.java:1053)
02-04 10:31:21.169: E/AndroidRuntime(1108):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1974)
02-04 10:31:21.169: E/AndroidRuntime(1108):     ... 11 more
02-04 10:31:23.268: I/Process(1108): Sending signal. PID: 1108 SIG: 9

Answer 1

替换这一行:

Intent getNotification = new Intent("com.example.notificationnotifier.MonitorNotification");

通过这个:

Intent getNotification = new Intent(GetNotification.this,
        MonitorNotification.class);

希望有帮助。