众所周知，android的设备千差万别，难免会发生崩溃异常等现象，这个时候就需要捕获哪些崩溃异常了，也就是捕获崩溃异常的相关信息，并记录下来，这样一来方便开发人员和测试人员的分析与调试。
1.首先我们得创建一个处理崩溃异常的类，暂且命名为：CrashHandler吧。实现如下：
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 java.util.TimeZone; import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.content.Intent;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.os.Build;
import android.os.Looper;
import android.sax.StartElementListener;
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到log文件中.
*
* @author caizhiming
*/
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 SimpleDateFormat formatter; /**
* 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 {
// 退出程序
try {
Thread.sleep(300);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
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(final Throwable ex) {
if (ex == null) {
return false;
} // Intent showcrashDLg = new Intent(mContext,CrashActivity.class);
// mContext.startActivity(showcrashDLg); ex.printStackTrace();
// 使用Toast来显示异常信息 // 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
*/
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 错误崩溃信息写到log文件中
*/
private void saveCrashInfoToFile(Throwable ex) {
StringBuffer sb = new StringBuffer();
sb.append("==============================Crash happened at Time："
+ CommonUtils.getCurTime()
+ "==============================\r\n");
for (Map.Entry<String, String> entry : infos.entrySet()) {
String key = entry.getKey();
String value = entry.getValue();
sb.append(key + "=" + value + "\r\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 {
LogCore.addLog(sb.toString()); } catch (Exception e) {
Log.e(TAG, "an error occured while writing file...", e);
}
Analyse.uplodcrash(sb.toString()); } /**
* 用Dialog显示错误信息
*
* @param ex
* @return 用Dialog显示错误信息
*/
private void showCrashInfoDialog(Throwable ex) { StringBuffer sb = new StringBuffer(); 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 {
// DlgUtils.ShowDialog(mContext,"程序崩溃了");
// LogCore.d(mContext,sb.toString());
AlertDialog.Builder builder = new AlertDialog.Builder(mContext);
builder.setTitle("程序崩溃啦~");
builder.setMessage(sb.toString());
builder.setPositiveButton("我知道了", new OnClickListener() { @Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
android.os.Process.killProcess(android.os.Process.myPid());
System.exit(1);
}
});
// builder.create().show();
} catch (Exception e) {
Log.e(TAG, "an error occured while writing file...", e);
}
} }
2.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.czm.crash;
import android.app.Application;
public class CrashApplication extends Application {
@Override
public void onCreate() {
super.onCreate();
CrashHandler crashHandler = CrashHandler.getInstance();
crashHandler.init(getApplicationContext());
}
}
3.除此之外，最后，为了让上面的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>