全局拦截异常

package com.dp.framework;  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;      }  }  

在继承了Application的类的onCreate()方法内写（注意这个类必须在清单文件内注册，例：在清单文件的application内写：android:name="com.dp.framework.MyApplication"）：CrashHandler crashHandler = CrashHandler.getInstance();  crashHandler.init(getApplicationContext());