android 运行时异常捕获

1，将运行时异常捕获并存到手机SD卡上

可以直接使用logcat 命令Runtime.getRuntime().exec("logcat -f "+ file.getAbsolutePath());指定文件路径就可以了

package com.hai.logcat;

import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.List;

import android.app.ActivityManager;
import android.app.ActivityManager.RunningAppProcessInfo;
import android.app.Service;
import android.content.Intent;
import android.os.Environment;
import android.os.IBinder;
import android.os.Looper;
import android.util.Log;
import android.widget.Toast;

public class MyLogcat extends Service {
	Thread thread;
	boolean readlog = true;

	@Override
	public IBinder onBind(Intent intent) {
		return null;
	}

	@Override
	public void onCreate() {
		super.onCreate();
		Log.d("hhp", "onCreate");
		thread = new Thread(new Runnable() {
			@Override
			public void run() {
				log2();//个人觉得这个方法更实用
			}
		});
	}

	@Override
	public void onStart(Intent intent, int startId) {
		thread.start();
		Log.d("hhp", "onStart");
		super.onStart(intent, startId);
	}

	/**
	 * 方法1
	 */
	private void log2() {
		Log.d("hhp", "log2 start");
		String[] cmds = { "logcat", "-c" };
		String shellCmd = "logcat -v time -s *:W "; // adb logcat -v time *:W
		Process process = null;
		Runtime runtime = Runtime.getRuntime();
		BufferedReader reader = null;
		try {
			runtime.exec(cmds).waitFor();
			process = runtime.exec(shellCmd);
			reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
			String line = null;
			while ((line = reader.readLine()) != null) {
				if (line.contains(String.valueOf(android.os.Process.myPid()))) {
					// line = new String(line.getBytes("iso-8859-1"), "utf-8");
					writeTofile(line);
				}
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		Log.d("hhp", "log2 finished");
	}

	/**
	 * 方法2
	 */
	private void log() {
		Log.d("hhp", "log start");
		String[] cmds = { "logcat", "-c" };
		String shellCmd = "logcat -v time -s *:W ";// //adb logcat -v time *:W
		Process process = null;
		InputStream is = null;
		DataInputStream dis = null;
		String line = "";
		Runtime runtime = Runtime.getRuntime();
		try {
			runtime.exec(cmds);
			process = runtime.exec(shellCmd);
			is = process.getInputStream();
			dis = new DataInputStream(is);
			// String filter = GetPid();
			String filter = android.os.Process.myPid() + "";
			while ((line = dis.readLine()) != null) { //这里如果输入流没断，会一直循环下去。
				line = new String(line.getBytes("iso-8859-1"), "utf-8");
				if (line.contains(filter)) {
					int pos = line.indexOf(":");
					Log.d("hhp2", line + "");
					writeTofile(line);
				}
			}
		} catch (Exception e) {
		}
		Log.d("hhp", "log finished");
	}

	private void writeTofile(String line) {
		String content = line + "
";
		File file = new File(Environment.getExternalStorageDirectory().getAbsolutePath()
				+ "/logcat/myLog.txt");
		if (!file.exists()) {
			try {
				file.createNewFile();
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
		FileOutputStream fos;
		try {
			fos = new FileOutputStream(file, true);
			fos.write(content.getBytes());
			fos.flush();
			fos.close();
		} catch (Exception e) {
			e.printStackTrace();
		}

	}

	@Override
	public void onDestroy() {
		super.onDestroy();
		stopSelf();
	}
}

 2，如果出现运行时异常，可以有一个友好的提示避免直接推出应用，还可以获取异常信息

package com.hai.logcat;

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;

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(final 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();
				ex.printStackTrace();
				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 + "
");
		}

		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();
		String time = formatter.format(new Date());
		sb.append(time + result);
		try {
			long timestamp = System.currentTimeMillis();
			String fileName = "crash.log";
			if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
				String path =Environment.getExternalStorageDirectory().getAbsolutePath()+ "/logcat/";
				File dir = new File(path);
				if (!dir.exists()) {
					dir.mkdirs();
				}
				FileOutputStream fos = new FileOutputStream(path + fileName, true);
				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Appliction 中的使用

package com.hai;

import android.app.Application;

import com.hai.logcat.CrashHandler;

public class MyApplication extends Application {
	CrashHandler handler = null;

	@Override
	public void onCreate() {
		super.onCreate();
		handler = CrashHandler.getInstance();
		handler.init(getApplicationContext());
	}
}