Android获得全部进程信息，并获得该进程使用的内存情况。

package zhangphil.process;

import java.util.List;
import android.os.Bundle;
import android.os.Debug.MemoryInfo;
import android.widget.TextView;
import android.app.Activity;
import android.app.ActivityManager;
import android.app.ActivityManager.RunningAppProcessInfo;
import android.content.Context;

public class MainActivity extends Activity {

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

		TextView tv = (TextView) findViewById(R.id.textView);

		ActivityManager activityManager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);

		String all = "";
		try {
			List<RunningAppProcessInfo> list = activityManager
					.getRunningAppProcesses();

			for (int i = 0; i < list.size(); i++) {
				RunningAppProcessInfo p = list.get(i);
				
				String info = "第 " + (i + 1) + " 个进程\n";
				info += "名称:" + p.processName + "\n";
				info += "id:" + p.pid + "\n";
				info += "用户id:" + p.uid + "\n";
				// 该进程使用的内存情况，MemoryInfo单位是KB
				int[] memoryPid = new int[] { p.pid };
				MemoryInfo[] memoryInfo = activityManager
						.getProcessMemoryInfo(memoryPid);
				// 进程内存使用情况，单位:MB
				int memSize = memoryInfo[0].dalvikPrivateDirty;
				String count = "";
				if (memSize < 1024)
					count = memSize + " KB";
				else
					count = memSize / 1024 + " MB";

				info += "使用的内存(dalvikPrivateDirty): " + count + "\n";
				info += "重要级:" + p.importance + "\n";

				all = all + info + "\n";
			}

		} catch (Exception e) {
			e.printStackTrace();
		}

		tv.setText(all);
	}
}

需要在AndroidManifest.xml添加权限：

<uses-permission android:name="android.permission.GET_TASKS" />

MainActivity.java需要的activity_main.xml文件：

  <ScrollView  xmlns:android="http:///apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >

         <TextView
        android:id="@+id/textView"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
       
    </ScrollView>