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if (appProcesses == null || appProcesses.size() == 0)
return false;
RunningTaskInfo rti = appProcesses.get(0);
String pn = rti.baseActivity.getPackageName();
String packageName = getPackageName();
return packageName.equals(pn);
package com.example.checkactivityisforeground;
import java.util.Timer;
import java.util.TimerTask;
import android.app.Activity;
import android.app.ActivityManager;
import android.app.ActivityManager.RunningTaskInfo;
import android.content.Context;
import android.os.Bundle;
import android.os.Handler;
import android.widget.Toast;
public class MainActivity extends Activity {
Handler mHandler = new Handler() {
public void handleMessage(android.os.Message msg) {
if (msg.what == 0) {
ActivityManager manager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
RunningTaskInfo info = manager.getRunningTasks(1).get(0);
String shortClassName = info.topActivity.getShortClassName(); // 类名
String className = info.topActivity.getClassName(); // 完整类名
String packageName = info.topActivity.getPackageName(); // 包名
Toast.makeText(MainActivity.this, "className:" + className, Toast.LENGTH_SHORT).show();
}
};
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//每3秒,显示一次当前顶栈的activity的类名,你需要其它功能的话自己改一下吧
new Timer().schedule(new TimerTask() {
@Override
public void run() {
// TODO Auto-generated method stub
mHandler.sendEmptyMessage(0);
}
}, 3 * 1000, 3 * 1000);
}
}
public class MainActivity extends Activity {
private Timer timer;
private Handler mHandler;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
timer = new Timer();
timer.schedule(new TimerTask() {
@Override
public void run() {
// 需要做的事:发送消息
Message message = new Message();
message.what = 1;
mHandler.sendMessage(message);
}
}, 2000,1000);
mHandler = new Handler(){
@Override
public void handleMessage(Message msg) {
isBackground(getApplicationContext());
super.handleMessage(msg);
}
};
}
public boolean isBackground(Context context) {
ActivityManager activityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
List<RunningAppProcessInfo> appProcesses = activityManager.getRunningAppProcesses();
for (RunningAppProcessInfo appProcess : appProcesses) {
if (appProcess.processName.equals(context.getPackageName())) {
if (appProcess.importance == RunningAppProcessInfo.IMPORTANCE_BACKGROUND) {
Log.i("后台", appProcess.processName);
return true;
}else{
Log.i("前台", appProcess.processName);
return false;
}
}
}
return false;
}
}