需求分析:
手机开机启动后,开始收集log日志信息并且将日志保存到SDcard。
功能实现:
(1)Manifest.xml文件
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.sony.logdemo"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk android:minSdkVersion="16" />
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
<uses-permission android:name="android.permission.READ_LOGS" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" >
</uses-permission>
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" >
</uses-permission>
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
<receiver android:name=".LogCatcherReceiver" >
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</receiver>
<service android:name="CatchLogService" >
<intent-filter>
<action android:name="com.sony.intent.action.CATCH_LOG" />
</intent-filter>
</service>
</application>
</manifest>
(2)开机启动后收到系统广播"android.intent.action.BOOT_COMPLETED",然后启动后台service,将log写入SDcard。
LogCatcherReceiver接收器:
package com.sony.logdemo;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.util.Log;
public class LogCatcherReceiver extends BroadcastReceiver {
static final String ACTION = "android.intent.action.BOOT_COMPLETED";
@Override
public void onReceive(Context context, Intent intent) {
// TODO Auto-generated method stub
Log.i("LogCatcherReceiver","receive log");
context.startService(new Intent(context,
CatchLogService.class));
}
}
后台Service:
package com.sony.logdemo;
import android.app.Service;
import android.content.Intent;
import android.os.Environment;
import android.os.IBinder;
import android.util.Log;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
public class CatchLogService extends Service {
@Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
Log.i("LogCatcherReceiver", "start service");
catchLog();
// TODO Auto-generated method stub
return super.onStartCommand(intent, flags, startId);
}
@Override
public void onCreate() {
// TODO Auto-generated method stub
super.onCreate();
}
public void catchLog() {
new Thread(new Runnable() {
public void run() {
// TODO Auto-generated method stub
try {
Thread.sleep(5000);
} catch (InterruptedException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
String shell = "logcat";
try {
Process process = Runtime.getRuntime().exec(shell);
InputStream inputStream = process.getInputStream();
boolean sdCardExist = Environment.getExternalStorageState().equals(
android.os.Environment.MEDIA_MOUNTED);
File dir = null;
if (sdCardExist) {
dir = new File(Environment.getExternalStorageDirectory().toString()
+ File.separator + "logcat.txt");
Log.i("LogCatcherReceiver", Environment.getExternalStorageDirectory()
.toString() + File.separator + "logcat.txt");
if (!dir.exists()) {
dir.createNewFile();
}
}
byte[] buffer = new byte[1024];
try {
if (dir == null) {
Log.i("LogCatcherReceiver", "file==null");
}
FileOutputStream fos = new FileOutputStream(dir);
int read = 0;
try {
{
while ((read = inputStream.read(buffer, 0, buffer.length)) != -1) {
fos.write(buffer, 0, read);
}
}
} finally {
fos.close();
}
} finally {
inputStream.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}).start();
}
}
service中让线程休眠了5秒,否则会crash,刚启动时SDcard为加载,sdCardExist=false.