Thread中提供了一個UncaughtExceptionHandler接口能夠獲取應用的crash信息
該方法設置系統的默認異常處理器,發生crash的時候,系統就會回調UncaughtExceptionHandler的uncaughtException(Thread t, Throwable e)
我們可以在uncaughtException方法中獲取到crash信息,也可以選擇把異常信息存儲到本地以及上傳到服務器提供給開發人員分析。
public class CrashHandler implements Thread.UncaughtExceptionHandler {
private static final String TAG = "CrashHandler";
private static final String PATH = Environment.getExternalStorageDirectory() + "/crash/log/";
private Context mContext;
private volatile static CrashHandler mCrashHandler;
private Thread.UncaughtExceptionHandler mDefaultHandler;
private CrashHandler() {
}
public static CrashHandler getInstance() {
if (mCrashHandler == null) {
synchronized (CrashHandler.class) {
if (mCrashHandler == null) {
mCrashHandler = new CrashHandler();
}
}
}
return mCrashHandler;
}
public void init(Context context) {
mContext = context.getApplicationContext();
mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();
Thread.setDefaultUncaughtExceptionHandler(this);
}
@Override
public void uncaughtException(Thread t, Throwable e) {
dumpExceptionToFile(e);
uploadExceptionToServer();
if (mDefaultHandler != null) {
//系統默認的異常處理器來處理,否則由自己來處理
mDefaultHandler.uncaughtException(t, e);
} else {
android.os.Process.killProcess(android.os.Process.myPid());
System.exit(1);
}
}
//可以根據自己需求來,比如獲取手機廠商、型號、系統版本、內存大小等等
private void dumpExceptionToFile(Throwable e) {
File dir = new File(PATH);
if (!dir.exists()) {
dir.mkdirs();
}
long timeMillis = System.currentTimeMillis();
String time = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date(timeMillis));
File file = new File(PATH + time + ".trace");
try {
PrintWriter pw = new PrintWriter(new BufferedWriter(new FileWriter(file)));
pw.println(time);
pw.print("Android版本號 :");
pw.println(Build.VERSION.RELEASE);
pw.print("手機型號 :");
pw.println(Build.MODEL);
pw.print("CUP架構 :");
pw.println(Build.CPU_ABI);
e.printStackTrace(pw);
pw.close();
} catch (IOException ex) {
Log.e(TAG, "dump crash info error");
}
}
// 上傳到Server
private void uploadExceptionToServer() {
// TODO
}
}
public class CrashApplication extends Application {
@Override
public void onCreate() {
super.onCreate();
// 在這裏爲程序設置異常處理,才能捕獲到未處理的異常
CrashHandler crashHandler = CrashHandler.getInstance();
crashHandler.init(getApplicationContext());
}
}
在Activity模擬一下異常,看程序是如何處理的
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
findViewById(R.id.button).setOnClickListener(this);
}
@Override
public void onClick(View v) {
if (v != null) {
throw new RuntimeException("自定義異常,模擬拋出異常~");
}
}
}
CrashHandler 創建了異常信息文件,在手機打開文件很方便的查看手機信息和異常信息。