捕获全局异常
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- package com.scott.crash;
- 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;
- 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.Looper;
- import android.util.Log;
- import android.widget.Toast;
- /**
- * 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.
- *
- * @author user
- *
- */
- public class CrashHandler implements UncaughtExceptionHandler {
- public static final String TAG = "CrashHandler";
- //系统默认的UncaughtException处理类
- private Thread.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(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
- 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);
- }
- 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 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 = "/sdcard/crash/";
- File dir = new File(path);
- if (!dir.exists()) {
- dir.mkdirs();
- }
- FileOutputStream fos = new FileOutputStream(path + fileName);
- fos.write(sb.toString().getBytes());
- fos.close();
- }
- return fileName;
- } catch (Exception e) {
- Log.e(TAG, "an error occured while writing file...", e);
- }
- return null;
- }
- }
完成这个CrashHandler后,我们需要在一个Application环境中让其运行,为此,我们继承android.app.Application,添加自己的代码,CrashApplication.java代码如下:
- package com.scott.crash;
- import android.app.Application;
- public class CrashApplication extends Application {
- @Override
- public void onCreate() {
- super.onCreate();
- CrashHandler crashHandler = CrashHandler.getInstance();
- crashHandler.init(getApplicationContext());
- }
- }
千万不要忘记呦
最后,为了让我们的CrashApplication取代android.app.Application的地位,在我们的代码中生效,我们需要修改AndroidManifest.xml:
- <application android:name=".CrashApplication" ...>
- </application>
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