MainActivity如下:
package cc.c; import java.io.BufferedReader; import java.io.FileReader; import java.io.IOException; import java.util.List; import android.app.Activity; import android.app.ActivityManager; import android.app.ActivityManager.MemoryInfo; import android.app.ActivityManager.RunningAppProcessInfo; import android.content.Context; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.TextView; /** * Demo描述: * 清理手机内存 * * 参考资料: * 1 http://blog.30c.org/1816.html * 2 http://www.cnblogs.com/helloandroid/archive/2011/10/14/2212334.html * Thank you very much * * 注意权限: * <uses-permission android:name="android.permission.KILL_BACKGROUND_PROCESSES" /> * */ public class MainActivity extends Activity { private TextView mTotalMemoryTextView; private TextView mAvailMemoryTextView; private Button mCleanButton; private TextView mCleanInfoTextView; private ActivityManager mActivityManager; private StringBuffer mCleanInfoStringBuffer; private long availMemory; private long totalMemory; private List<RunningAppProcessInfo> mRunningAppProcessInfoList; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); init(); } private void init() { mCleanInfoStringBuffer = new StringBuffer(); mActivityManager=(ActivityManager) getSystemService(Context.ACTIVITY_SERVICE); mTotalMemoryTextView = (TextView) findViewById(R.id.totalMemoryTextView); mAvailMemoryTextView = (TextView) findViewById(R.id.availMemoryTextView); mCleanInfoTextView = (TextView) findViewById(R.id.cleanInfoTextView); mCleanButton = (Button) findViewById(R.id.cleanButton); totalMemory = getTotalMemory(); availMemory = getAvailMemory(); mTotalMemoryTextView.setText(totalMemory + "MB"); mAvailMemoryTextView.setText(availMemory + "MB"); mCleanButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { RunningAppProcessInfo runningAppProcessInfo=null; mRunningAppProcessInfoList= mActivityManager.getRunningAppProcesses(); //List<ActivityManager.RunningServiceInfo> serviceInfos = mActivityManager.getRunningServices(100); if (mRunningAppProcessInfoList != null) { for (int i = 0; i < mRunningAppProcessInfoList.size(); ++i) { runningAppProcessInfo= mRunningAppProcessInfoList.get(i); // 一般数值大于RunningAppProcessInfo.IMPORTANCE_SERVICE // 的进程即为长时间未使用进程或者空进程 // 一般数值大于RunningAppProcessInfo.IMPORTANCE_VISIBLE // 的进程都是非可见进程,即在后台运行 if (runningAppProcessInfo.importance > RunningAppProcessInfo.IMPORTANCE_VISIBLE) { String[] pkgList = runningAppProcessInfo.pkgList; for (int j = 0; j < pkgList.length; ++j) { mActivityManager.killBackgroundProcesses(pkgList[j]); mCleanInfoStringBuffer.append(pkgList[j] + " is killed...\n"); mCleanInfoTextView.setText(mCleanInfoStringBuffer.toString()); } } } } //再次获得剩余内存以计算清理值 mCleanInfoStringBuffer.append("共清理:"+(getAvailMemory() - availMemory) + "MB"); mCleanInfoTextView.setText(mCleanInfoStringBuffer.toString()); mAvailMemoryTextView.setText(getAvailMemory() + "MB"); } }); } private long getTotalMemory() { //系统的内存信息文件 String filePath = "/proc/meminfo"; String lineString; String[] stringArray; long totalMemory = 0; try { FileReader fileReader = new FileReader(filePath); BufferedReader bufferedReader = new BufferedReader(fileReader,1024 * 8); //读取meminfo第一行,获取系统总内存大小 lineString = bufferedReader.readLine(); //按照空格拆分 stringArray = lineString.split("\\s+"); //获得系统总内存,单位KB totalMemory = Integer.valueOf(stringArray[1]).intValue(); bufferedReader.close(); System.out.println("------> lineString=" + lineString+ ",stringArray[0]=" + stringArray[0] + ",stringArray[1]="+ stringArray[1] + ",stringArray[2]=" + stringArray[2]); } catch (IOException e) { } return totalMemory / 1024; } private long getAvailMemory() { MemoryInfo memoryInfo = new MemoryInfo(); mActivityManager.getMemoryInfo(memoryInfo); return memoryInfo.availMem / (1024 * 1024); } }
main.xml如下:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" > <TextView android:id="@+id/totalTextView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="系统内存:" android:textSize="25sp" android:textColor="#1cf109" /> <TextView android:id="@+id/totalMemoryTextView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_toRightOf="@id/totalTextView" android:textSize="25sp" android:textColor="#1cf109" /> <TextView android:id="@+id/availTextView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/totalTextView" android:text="可用内存:" android:textSize="25sp" android:textColor="#5c0169" /> <TextView android:id="@+id/availMemoryTextView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/totalTextView" android:layout_toRightOf="@id/availTextView" android:textSize="25sp" android:textColor="#5c0169" /> <Button android:id="@+id/cleanButton" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_below="@id/availMemoryTextView" android:textSize="25sp" android:text="清理内存" /> <ScrollView android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_below="@id/cleanButton" > <TextView android:id="@+id/cleanInfoTextView" android:layout_width="fill_parent" android:layout_height="wrap_content" /> </ScrollView> </RelativeLayout>
Android清理设备内存详细完整示例
时间: 2024-10-14 10:30:29