全屏异常捕捉

这个工具只能捕获 Java 层的崩溃，Native 层的捕获不到

CrashHandler（工具类）

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.util.Log;

import java.io.File;
import java.io.FileOutputStream;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.io.Writer;
import java.lang.Thread.UncaughtExceptionHandler;
import java.lang.reflect.Field;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
/**
 * UncaughtException处理类,当程序发生Uncaught异常的时候,有该类来接管程序,并记录发送错误报告.
 */
public class CrashHandler implements UncaughtExceptionHandler {

    public static final String TAG = "CrashHandler";

    //系统默认的UncaughtException处理类
    private UncaughtExceptionHandler mDefaultHandler;
    //CrashHandler实例
    private static CrashHandler INSTANCE = new CrashHandler();
    //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
    private DateFormat formatter = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss");

    /** 保证只有一个CrashHandler实例 */
    private CrashHandler() {
    }

    /** 获取CrashHandler实例 ,单例模式 */
    public static CrashHandler getInstance() {
        return INSTANCE;
    }

    /**
     * 初始化
     *
     * @param context
     */
    public 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(1000);
            } catch (InterruptedException e) {
                Log.e(TAG, "error : " + e.getMessage());
            }
            //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
        saveCrashInfo2File(ex);
        return true;
    }

    /**
     * 收集设备参数信息
     * @param ctx
     */
    public 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 (NameNotFoundException e) {
            Log.e(TAG, "an error occured when collect package info" + e.getMessage());
        }
        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.getMessage());
            }
        }
    }

    /**
     * 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 String saveCrashInfo2File(Throwable ex) {

        StringBuffer sb = new StringBuffer();
        for (Map.Entry<String, String> entry : infos.entrySet()) {
            String key = entry.getKey();
            String value = entry.getValue();
            sb.append(key + "=" + value + "\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 {
            long timestamp = System.currentTimeMillis();
            String time = formatter.format(new Date());
            String fileName = "crash-" + time + "-" + timestamp + ".log";
            /*if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
                String path = Environment.getExternalStorageDirectory() + "/"+ BaseApp.getInstance().getResources().getString(R.string.app_name) + "/crash/";
                File dir = new File(path);
                if (!dir.exists()) {
                    dir.mkdirs();
                }
                FileOutputStream fos = new FileOutputStream(path + fileName);
                fos.write(sb.toString().getBytes());
                fos.close();
            }*/
            String path = mContext.getCacheDir() + File.separator + "crash" + File.separator;
            String fullPath = path + fileName;
            final File file = new File(fullPath);
            final File parentFile = file.getParentFile();
            if (!parentFile.exists()) {
                parentFile.mkdirs();
            }
            if (!file.exists()) {
                file.createNewFile();
            }
            fos = new FileOutputStream(file);
            fos.write(sb.toString().getBytes());
            return fileName;
        } catch (Exception e) {
            Log.e(TAG, "an error occured while writing file..." + e.getMessage());
        } finally {
            try {
                if (fos != null) {
                    fos.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return null;
    }
}

用法

在 Application 中初始化
CrashHandler 主要是需要 applicationContext，所以也不一定非要在 Application 中初始化，只要能给 CrashHandler 传 applicationContext 就行。 例如在 Activity 中初始化：instance.init(getApplicationContext());

public class BaseApp extends Application {
    private static BaseApp sBaseApp;

    @Override
    public void onCreate() {
        super.onCreate();
        sBaseApp = this;

        initCrashHandler();

    }

    private void initCrashHandler() {
        CrashHandler instance = CrashHandler.getInstance();
        instance.init(BaseApp.getInstance());
    }

    public static BaseApp getInstance(){
        return sBaseApp;
    }

    public static Resources getRes() {
        return sBaseApp.getResources();
    }
}

在清单文件里配置Application