描述：App级异常捕获，并记录下CrashLog到文件。
以下，代码。
在Application的，onCreate中，初始化自定义的CrashHandler
import android.app.Application;自定义CrashHandler如下
import com.tjd.appexceptioncatch.exception.CrashHandler;
public class MyApplication extends Application {
private static MyApplication instance;
@Override
public void onCreate() {
super.onCreate();
CrashHandler.getInstance().init(getApplicationContext());
}
public static MyApplication getInstance() {
if (instance == null) {
instance = new MyApplication();
}
return instance;
}
}
import java.io.File;在MainActivity中触发异常
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;
import com.tjd.appexceptioncatch.application.MyApplication;
/**
* 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.
* 需要在Application中注册，为了要在程序启动器就监控整个程序。
*/
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;
//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() {
if (instance == null)
instance = new CrashHandler();
return instance;
}
/**
* 初始化
*/
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;
}
//收集设备参数信息
collectDeviceInfo(mContext);
//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_SHORT).show();
Looper.loop();
}
}.start();
//保存日志文件
saveCatchInfo2File(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);
}
}
}
private String getFilePath() {
String file_dir = "";
// SD卡是否存在
boolean isSDCardExist = Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState());
// Environment.getExternalStorageDirectory()相当于File file=new File("/sdcard")
boolean isRootDirExist = Environment.getExternalStorageDirectory().exists();
if (isSDCardExist && isRootDirExist) {
file_dir = Environment.getExternalStorageDirectory().getAbsolutePath() + "/crashlog/";
} else {
// MyApplication.getInstance().getFilesDir()返回的路劲为/data/data/PACKAGE_NAME/files，其中的包就是我们建立的主Activity所在的包
file_dir = MyApplication.getInstance().getFilesDir().getAbsolutePath() + "/crashlog/";
}
return file_dir;
}
/**
* 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 saveCatchInfo2File(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";
String file_dir = getFilePath();
//if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
File dir = new File(file_dir);
if (!dir.exists()) {
dir.mkdirs();
}
File file = new File(file_dir + fileName);
if (!file.exists()) {
file.createNewFile();
}
FileOutputStream fos = new FileOutputStream(file);
fos.write(sb.toString().getBytes());
//发送给开发人员
sendCrashLog2PM(file_dir + fileName);
fos.close();
//}
return fileName;
} catch (Exception e) {
Log.e(TAG, "an error occured while writing file...", e);
}
return null;
}
/**
* 将捕获的导致崩溃的错误信息发送给开发人员
* 目前只将log日志保存在sdcard 和输出到LogCat中，并未发送给后台。
*/
private void sendCrashLog2PM(String fileName) {
//if (!new File(fileName).exists()) {
//Toast.makeText(mContext, "日志文件不存在！", Toast.LENGTH_SHORT).show();
//return;
//}
//FileInputStream fis = null;
//BufferedReader reader = null;
//String s = null;
//try {
//fis = new FileInputStream(fileName);
//reader = new BufferedReader(new InputStreamReader(fis, "GBK"));
//while (true) {
//s = reader.readLine();
//if (s == null)
//break;
////由于目前尚未确定以何种方式发送，所以先打出log日志。
//Log.i("info", s.toString());
//}
//} catch (FileNotFoundException e) {
//e.printStackTrace();
//} catch (IOException e) {
//e.printStackTrace();
//} finally { // 关闭流
//try {
//reader.close();
//fis.close();
//} catch (IOException e) {
//e.printStackTrace();
//}
//}
}
}
import android.app.Activity;本地项目名备忘：AppExceptionCatch
import android.os.Bundle;
public class MainActivity extends Activity {
final String str = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
str.equals("exception");
}
}