对于一个Android库项目,我正在尝试创建一个Force Close,它会向该库的用户显示他忘记做某事。
为此,我尝试创建自定义异常,并throw
,但我只有一些警告在LogCat中,仅此而已。
例如:
MyActivity.java
protected void onResume() {
super.onResume();
try {
this.isMenuButtonOk();
} catch(MyCustomException e) {
e.printStackTrace();
}
}
private void isMenuButtonOk() throws MyCustomException{
if(!this.mOnCreateOptionsMenuHasBeenCalledFlag)
throw new MyCustomException("OnCreateOptionMenu() needs to call it's parent. Or you need to deactivate the use of the menubutton");
}
logcat的
08-02 18:28:13.507 3866-3866/com.example.testlibrary W/System.err: com.example.testlibrary.MyCustomException: OnCreateOptionMenu() needs to call it's parent. Or you need to deactivate the use of the menubutton
08-02 18:28:13.511 3866-3866/com.example.testlibrary W/System.err: at com.example.testlibrary.lib.MyActivity.isMenuButtonOk(MyActivity.java:286)
08-02 18:28:13.511 3866-3866/com.example.testlibrary W/System.err: at com.example.testlibrary.lib.MyActivity.onResume(MyActivity.java:244)
08-02 18:28:13.511 3866-3866/com.example.testlibrary W/System.err: at com.example.testlibrary.MainActivity.onResume(MainActivity.java:304)
08-02 18:28:13.511 3866-3866/com.example.testlibrary W/System.err: at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1184)
08-02 18:28:13.511 3866-3866/com.example.testlibrary W/System.err: at android.app.Activity.performResume(Activity.java:5082)
08-02 18:28:13.511 3866-3866/com.example.testlibrary W/System.err: at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2565)
08-02 18:28:13.511 3866-3866/com.example.testlibrary W/System.err: at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2603)
08-02 18:28:13.511 3866-3866/com.example.testlibrary W/System.err: at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2089)
08-02 18:28:13.511 3866-3866/com.example.testlibrary W/System.err: at android.app.ActivityThread.access$600(ActivityThread.java:130)
08-02 18:28:13.511 3866-3866/com.example.testlibrary W/System.err: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
08-02 18:28:13.511 3866-3866/com.example.testlibrary W/System.err: at android.os.Handler.dispatchMessage(Handler.java:99)
08-02 18:28:13.511 3866-3866/com.example.testlibrary W/System.err: at android.os.Looper.loop(Looper.java:137)
08-02 18:28:13.511 3866-3866/com.example.testlibrary W/System.err: at android.app.ActivityThread.main(ActivityThread.java:4745)
08-02 18:28:13.511 3866-3866/com.example.testlibrary W/System.err: at java.lang.reflect.Method.invokeNative(Native Method)
08-02 18:28:13.511 3866-3866/com.example.testlibrary W/System.err: at java.lang.reflect.Method.invoke(Method.java:511)
08-02 18:28:13.511 3866-3866/com.example.testlibrary W/System.err: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
08-02 18:28:13.515 3866-3866/com.example.testlibrary W/System.err: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
08-02 18:28:13.515 3866-3866/com.example.testlibrary W/System.err: at dalvik.system.NativeStart.main(Native Method)
您是否知道如何在发生此异常时模拟/创建此力量?
答案 0 :(得分:3)
如果您catch
出现异常并打印堆栈跟踪,是的,您会收到“警告”并且应用程序不会崩溃 - 这是捕获异常的重点。确保MyCustomException
扩展RuntimeException
(或使用RuntimeException),并且不要将isMenuButtonOk()
方法throws
声明为您的例外。
例如:
protected void onResume() {
super.onResume();
this.isMenuButtonOk();
}
private void isMenuButtonOk(){
if(!this.mOnCreateOptionsMenuHasBeenCalledFlag){
throw new RuntimeException("OnCreateOptionMenu() needs to call it's parent. Or you need to deactivate the use of the menubutton");
}
}
答案 1 :(得分:0)
使用单个按钮显示Dialog
,表示强制关闭,Button
的正文显示System.exit(1);
AlertDialog alertDialog = new AlertDialog.Builder(getApplicationContext()).create();
alertDialog.setTitle("An error occured");
alertDialog.setMessage(<your-message>);
alertDialog.setButton("Force Close", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
System.exit(1);
}
});
alertDialog.show();
答案 2 :(得分:0)
try {
...
} catch (Exception e) {
//some code
}
这将捕获您的应用程序所做的所有异常,因为它们都是Exception的后代,请记住这是一个非常折旧的方法