如何使用getRunningAppProcesses（）在android系统？ [英] how to use getRunningAppProcesses() in android?

问题描述

我有下面这段code的：

i have the following piece of code :

package com.example.task;

import java.util.List;

import android.os.Bundle;
import android.app.Activity;
import android.app.ActivityManager;
import android.app.ActivityManager.RunningAppProcessInfo;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class MainTask extends Activity {

private Button BprocessesShow;
private TextView processesShow;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main_task);

    ActivityManager manager =       (ActivityManager)getSystemService(ACTIVITY_SERVICE);
     final List<ActivityManager.RunningAppProcessInfo> runningProcesses = manager.getRunningAppProcesses();


    BprocessesShow=(Button) this.findViewById(R.id.BshowProcesses);
    processesShow=(TextView) this.findViewById(R.id.showProcesses);     


    BprocessesShow.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {


            processesShow.setText((CharSequence) runningProcesses);
        }
    });

}




@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.activity_main_task, menu);
    return true;
}

}

以及所有我想要做的是，当用户presses我做了，我想向他出示/她的一切都有他的手机上运行的进程按钮...当我运行这个应用程序我手机应用程序崩溃，我得到的是一个不幸的消息任务（这是我的名字的应用程序）已停止...任何帮助将是非常有用的！

well all i want to do is, when the user presses the button i made i want to show him/her all the running processes that has on his phone ...When i'm running this application on my cellphone the app crashes and all i get is a message Unfortunately Task(that's my name's app) has stopped...Any help would be very useful!!

推荐答案

在此行

processesShow.setText((CharSequence) runningProcesses);

您是铸造一个Li​​st成的CharSequence。尝试沿着这些路线的内容：

you are casting a List into a CharSequence. Try something along these lines:

StringBuilder b = new StringBuilder();
for (ActivityManager.RunningAppProcessInfo process: runningProcesses) {
    b.append(processs.processName);
    b.append("\n");
}
processesShow.setText(b.toString());

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