android 異常處理 對異常進行全局捕捉

最近新產(chǎn)品測試，頻頻出現(xiàn)異常。所以需要對異常進行全局捕捉。
翻閱大量帖子、源碼終于找到了UncaughtExceptionHandler接口。廢話不多說還是直接上源碼吧。

首先實現(xiàn)UncaughtExceptionHandler

public class CatchHandler implements UncaughtExceptionHandler{

        private CatchHandler() {
        }

        public static CatchHandler getInstance() {

                return mCatchHandler;
        }

        private static CatchHandler mCatchHandler = new CatchHandler();

        private Context mContext;

        private DateFormat formatter = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss");

        @Override
        public void uncaughtException(Thread thread, Throwable ex) {
                if (thread.getName().equals("main")) {
                        ToastException(thread, ex);
                        try {
                                Thread.sleep(3000);
                        } catch (InterruptedException e) {
                        }
                        android.os.Process.killProcess(android.os.Process.myPid());
                        System.exit(1);
                } else {
                        handleException(thread, ex);
                }

        }

        public void init(Context context) {
                mContext = context;
                Thread.setDefaultUncaughtExceptionHandler(this);
        }

        private void ToastException(final Thread thread, final Throwable ex) {
                new Thread() {
                        @Override
                        public void run() {
                                Looper.prepare();
                                StringBuilder builder = new StringBuilder();
                                builder.append("At thread: ").append(thread.getName())
                                                .append("\n");
                                builder.append("Exception is :\n").append(ex.getMessage());

                                Toast.makeText(mContext, builder.toString(), Toast.LENGTH_LONG)
                                                .show();
                                Looper.loop();
                        }
                }.start();
        }

        private void handleException(final Thread thread, final Throwable ex) {
                Intent intent =new Intent("per.xch.test2_35.main");
                <font color="#00ed00">intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);</font>
                mContext.startActivity(intent);
        }
}

然后在項目中引用

public class CatchApplication extends Application {
        @Override
        public void onCreate() {
                super.onCreate();
                CatchHandler.getInstance().init(getApplicationContext());
        }
}

注意

<application
        <font color="#00ed00">android:name=".CatchApplication"</font>

最后測試下

public class MainActivity extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        new Thread(new Runnable() {
                        
                        @Override
                        public void run() {
                                 throw new NullPointerException("please catch me! sub thread");
                        }
                }).start();
        throw new NullPointerException("please catch me! sub thread");
       
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }
}

之所以在主線程和其他線程采用不同處理方式因為主線程崩潰很大程度上就沒的救了。
還有要注意的是intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
原因很簡單，源碼寫的很明白

ContextImpl.java

  @Override
    public void startActivity(Intent intent) {
        if ((intent.getFlags()&Intent.FLAG_ACTIVITY_NEW_TASK) == 0) {
            throw new AndroidRuntimeException(
                    "Calling startActivity() from outside of an Activity "
                    + " context requires the FLAG_ACTIVITY_NEW_TASK flag."
                    + " Is this really what you want?");
        }
        mMainThread.getInstrumentation().execStartActivity(
            getOuterContext(), mMainThread.getApplicationThread(), null,
            (Activity)null, intent, -1);
    }

至于怎么把activity怎么變成dialog我就不廢話嘍，吼，閃人。