全局捕获异常信息[UncaughtExceptionHandler]

1. 实现系统提供的UncaughtExceptionHandler类

import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.os.Build;
import android.os.Environment;
import android.os.Process;
import android.util.Log;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.lang.Thread.UncaughtExceptionHandler;
import java.text.SimpleDateFormat;
import java.util.Date;

public class CrashHandler implements UncaughtExceptionHandler {

    private static final String TAG = "CrashHandler";
    private static final boolean DEBUG = true;

    // 崩溃日志存储位置及文件
    private static final String PATH = Environment.getExternalStorageDirectory().getPath() + "/CrashCollect/log/";
    private static final String FILE_NAME = "crash";
    private static final String FILE_NAME_SUFFIX = ".trace";

    private static CrashHandler sInstance = new CrashHandler();
    private UncaughtExceptionHandler mDefaultCrashHandler;
    private Context mCtx;

    private CrashHandler() {
    }

    public static CrashHandler getInstance() {
        return sInstance;
    }

    public void init(Context context) {
        mDefaultCrashHandler = Thread.getDefaultUncaughtExceptionHandler();
        Thread.setDefaultUncaughtExceptionHandler(this);
        mCtx = context.getApplicationContext();
    }

    /**
     * 这个是最关键的函数，当程序中有未被捕获的异常，系统将会自动调用#uncaughtException方法
     * thread为出现未捕获异常的线程，ex为未捕获的异常，有了这个ex，我们就可以得到异常信息
     */
    @Override
    public void uncaughtException(Thread thread, Throwable ex) {
        
        try {
            //导出异常信息到SD卡中
            dumpExceptionToSDCard(ex);
            //这里可以通过网络上传异常信息到服务器，便于开发人员分析日志从而解决bug
            uploadExceptionToServer();
            
        } catch (IOException e) {
            e.printStackTrace();
        }

        ex.printStackTrace();

        //如果系统提供了默认的异常处理器，则交给系统去结束我们的程序，否则就由我们自己结束自己
        if (mDefaultCrashHandler != null) {
            mDefaultCrashHandler.uncaughtException(thread, ex);
        } else {
            Process.killProcess(Process.myPid());
        }

    }

    private void dumpExceptionToSDCard(Throwable ex) throws IOException {

         //如果SD卡不存在或无法使用，则无法把异常信息写入SD卡
        if (!Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
            if (DEBUG) {
                Log.w(TAG, "sdcard unmounted,skip dump exception");
                return;
            }
        }

        File dir = new File(PATH);
        if (!dir.exists()) {
            dir.mkdirs();
        }
        long current = System.currentTimeMillis();
        String time = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date(current));
        File file = new File(PATH + FILE_NAME + time + FILE_NAME_SUFFIX);

        try {
            PrintWriter pw = new PrintWriter(new BufferedWriter(new FileWriter(file)));
            pw.println(time);
            dumpPhoneInfo(pw);
            pw.println();
            ex.printStackTrace(pw);
            pw.close();
        } catch (Exception e) {
            Log.w(TAG, "dump crash info failed");
        }
    }

    private void dumpPhoneInfo(PrintWriter pw) throws NameNotFoundException {
        PackageManager pm = mCtx.getPackageManager();
        PackageInfo pi = pm.getPackageInfo(mCtx.getPackageName(), PackageManager.GET_ACTIVITIES);
        pw.print("App Version: ");
        pw.print(pi.versionName);
        pw.print('_');
        pw.println(pi.versionCode);

        //android版本号
        pw.print("OS Version: ");
        pw.print(Build.VERSION.RELEASE);
        pw.print("_");
        pw.println(Build.VERSION.SDK_INT);

        //手机制造商
        pw.print("Vendor: ");
        pw.println(Build.MANUFACTURER);

        //手机型号
        pw.print("Model: ");
        pw.println(Build.MODEL);

        //cpu架构
        pw.print("CPU ABI: ");
        pw.println(Build.CPU_ABI);
    }

    private void uploadExceptionToServer() {
        //TODO 上传崩溃信息至服务器
    }
}

1. 在自己的Application类中初始化崩溃信息收集类CrashHandler

public class CurrentApplication extends Application {

    private static CurrentApplication sInstance;

    @Override
    public void onCreate() {
        super.onCreate();

        sInstance = this;
        // 在这里为应用设置异常处理程序，然后我们的程序才能捕获未处理的异常
        CrashHandler crashHandler = CrashHandler.getInstance();
        crashHandler.init(this);
    }

    public static CurrentApplication getInstance() {
        return sInstance;
    }
}

1. 实验一个错误

• 在Activity中添加 ​​8/0;​​ 后运行

public class OneActivity extends AppCompatActivity {

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

        int i = 8 / 0;

    }
}

• 系统文件中会出现崩溃日志文件



• 
  

如日志显示的错误结果相同，即除0错误