获取当前系统的可用内存信息

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import android.app.Activity;import android.app.ActivityManager;import android.app.ActivityManager.MemoryInfo;import android.os.Bundle;import android.widget.TextView;public class MainActivity extends Activity {    private ActivityManager am;     @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        am = (ActivityManager) getSystemService(ACTIVITY_SERVICE);        TextView textview = (TextView) findViewById(R.id.textview);        textview.setText("剩余内存:"+getAvailMemoryInfo(am));  //        textview.setText("");    }    /**      * 获取当前系统的可用内存信息      */      private String getAvailMemoryInfo(ActivityManager am){          MemoryInfo outInfo = new ActivityManager.MemoryInfo();          am.getMemoryInfo(outInfo);//获取的内存信息放入到outInfo中          long size = outInfo.availMem/(1024*1024);//当前系统中剩余的可用内存信息 单位 byte          return size+"MB";    }}