Android 异常捕获存储

Android 异常

就 Java 语言来说，所有的异常都继承自 Throwable

Thorwalbe
- Error
- Exception

其中,Error 是底层代码产生的，在前端开发时可以不管，但是开发时需要避免引起这类错误，比如图片过大

Error
- VirtualMachineException

而 Exception 是因为代码不规范导致的异常错误，常见的代表性异常：

- IOException
- - FileNoFoundException
- - EOFException

- RuntimeException
- - ClassCastException
- - ArrayIndexOutOfBoundsException

第三方捕获异常库

腾讯的 Bugly
```
https://bugly.qq.com/
```
友盟的

异常捕获并存储类

实现抛出一个异常

实现捕获这个异常，并存储到本地文件

添加权限

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

修改 Application

android:name = “.CrashApplication”

CrashHandler.java

扫描二维码关注公众号，回复： 2797091 查看本文章

package com.thorn.catchexceptiondemo;

import android.annotation.SuppressLint;
import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.os.Build;
import android.os.Environment;
import android.os.Looper;
import android.util.Log;
import android.widget.Toast;

import java.io.File;
import java.io.FileOutputStream;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.io.Writer;
import java.lang.reflect.Field;
import java.sql.Date;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.HashMap;
import java.util.Map;

public class CrashHandler implements Thread.UncaughtExceptionHandler {

    private final String TAG = "CrashHandler";
    private final String PATH = Environment.getExternalStorageDirectory().getPath() + "/crash_log/";
    // 系统默认的UncaughtException处理类
    private Thread.UncaughtExceptionHandler mDefaultHandler;
    // 程序的Context对象
    private Context mContext;
    // 用来存储设备信息和异常信息
    private Map<String, String> infos = new HashMap<String, String>();

    // 用于格式化日期,作为日志文件名的一部分
    @SuppressLint("SimpleDateFormat")
    private DateFormat formatter = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss-SSS");

    private CrashHandler() {
    }

    /**
     * 获取CrashHandler实例 ,单例模式
     */
    @SuppressWarnings("WeakerAccess")
    protected static CrashHandler getCrashHandlerInstance() {
        return CrashInstanceHolder.CRASH_INSTANCE;
    }

    /**
     * 初始化
     *
     * @param context
     */
    @SuppressWarnings("WeakerAccess")
    protected void init(Context context) {
        mContext = context;
        // 获取系统默认的UncaughtException处理器
        mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();
        // 设置该CrashHandler为程序的默认处理器
        Thread.setDefaultUncaughtExceptionHandler(this);
    }

    /**
     * 当UncaughtException发生时会转入该函数来处理
     */
    @Override
    public void uncaughtException(Thread thread, Throwable ex) {
        if (!handleException(ex) && mDefaultHandler != null) {
            // 如果用户没有处理则让系统默认的异常处理器来处理
            mDefaultHandler.uncaughtException(thread, ex);
        } else {
            try {
                Thread.sleep(3000);
            } catch (InterruptedException e) {
                Log.e(TAG, "error : ", e);
            }
            // 退出程序
            android.os.Process.killProcess(android.os.Process.myPid());
            System.exit(1);
        }
    }

    /**
     * 自定义错误处理,收集错误信息 发送错误报告等操作均在此完成.
     *
     * @param ex
     * @return true:如果处理了该异常信息;否则返回false.
     */
    private boolean handleException(Throwable ex) {
        if (ex == null) {
            return false;
        }
        // 使用Toast来显示异常信息
        new Thread() {
            @Override
            public void run() {
                Looper.prepare();
                Toast.makeText(mContext, "很抱歉,程序出现异常即将退出.", Toast.LENGTH_LONG).show();
                Looper.loop();
            }
        }.start();
        // 收集设备参数信息
        collectDeviceInfo(mContext);
        // 保存日志文件
        saveCrashInfoToFile(ex);
        return true;
    }

    /**
     * 收集设备参数信息
     *
     * @param ctx
     */
    private void collectDeviceInfo(Context ctx) {
        try {
            PackageManager pm = ctx.getPackageManager();
            PackageInfo pi = pm.getPackageInfo(ctx.getPackageName(), PackageManager.GET_ACTIVITIES);
            if (pi != null) {
                String versionName = pi.versionName == null ? "null" : pi.versionName;
                String versionCode = pi.versionCode + "";
                infos.put("versionName", versionName);
                infos.put("versionCode", versionCode);
            }
        } catch (PackageManager.NameNotFoundException e) {
            Log.e(TAG, "an error occured when collect package info", e);
        }
        Field[] fields = Build.class.getDeclaredFields();
        for (Field field : fields) {
            try {
                field.setAccessible(true);
                infos.put(field.getName(), field.get(null).toString());
                Log.d(TAG, field.getName() + " : " + field.get(null));
            } catch (Exception e) {
                Log.e(TAG, "an error occured when collect crash info", e);
            }
        }
    }

    /**
     * 保存错误信息到文件中
     *
     * @param ex
     * @return 返回文件名称, 便于将文件传送到服务器
     */
    private void saveCrashInfoToFile(Throwable ex) {

        @SuppressWarnings("StringBufferMayBeStringBuilder") StringBuffer sb = new StringBuffer();
        for (Map.Entry<String, String> entry : infos.entrySet()) {
            String key = entry.getKey();
            String value = entry.getValue();
            sb.append(key).append("=").append(value).append("\n");
        }

        Writer writer = new StringWriter();
        PrintWriter printWriter = new PrintWriter(writer);
        ex.printStackTrace(printWriter);
        Throwable cause = ex.getCause();
        while (cause != null) {
            cause.printStackTrace(printWriter);
            cause = cause.getCause();
        }
        printWriter.close();
        String result = writer.toString();
        sb.append(result);
        try {
            //以当前时间作为文件名
            final String FILE_NAME = formatter.format(new Date(System.currentTimeMillis())) + ".txt";
            if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {

                ;
                File dir = new File(PATH);
                if (!dir.exists()) {
                    //noinspection ResultOfMethodCallIgnored
                    boolean isMkdirs = dir.mkdirs();
                }
                FileOutputStream fos = new FileOutputStream(PATH + FILE_NAME);
                fos.write(sb.toString().getBytes("UTF-8"));
                fos.close();
            }
        } catch (Exception e) {
            Log.e(TAG, "an error occured while writing file...", e);
        }
    }

    private static final class CrashInstanceHolder {
        // CrashHandler实例
        @SuppressLint("StaticFieldLeak")
        private static final CrashHandler CRASH_INSTANCE = new CrashHandler();
    }
}

CrashApplication.java

package com.thorn.catchexceptiondemo;

import android.app.Application;

public class CrashApplication extends Application {

    @Override
    public void onCreate() {
        super.onCreate();
        CrashHandler.getCrashHandlerInstance().init(this);
    }
}

MainActivity.java

package com.thorn.catchexceptiondemo;

import android.content.pm.PackageManager;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        TextView mTvHello = findViewById(R.id.tv_hello);

        getPermission();//动态获取权限

        mTvHello.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                int a = 10 / 0;
            }
        });
    }


    private void getPermission() {
        ActivityCompat.requestPermissions(MainActivity.this, new String[]{android
                .Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        switch (requestCode) {
            case 1:
                if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    Log.e("jin","权限获取成功");
                    break;
                }
            default:
                break;
        }
    }
}

Android 异常捕获存储

Android 异常

第三方捕获异常库

异常捕获并存储类

猜你喜欢