实现思路 调用系统的killBackgroundProcesses
具体实现如下:
1.配置权限
<uses-permission android:name="android.permission.KILL_BACKGROUND_PROCESSES"/>
2.具体实现流程
public class ClearMemoryActivity extends Activity { private static final String TAG = "ClearMemoryActivity"; /** * Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Button clear = (Button) findViewById(R.id.clear); clear.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { //To change body of implemented methods use File | Settings | File Templates. ActivityManager am = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE); List<RunningAppProcessInfo> infoList = am.getRunningAppProcesses(); List<ActivityManager.RunningServiceInfo> serviceInfos = am.getRunningServices(100); long beforeMem = getAvailMemory(ClearMemoryActivity.this); Log.d(TAG, "-----------before memory info : " + beforeMem); int count = 0; if (infoList != null) { for (int i = 0; i < infoList.size(); ++i) { RunningAppProcessInfo appProcessInfo = infoList.get(i); Log.d(TAG, "process name : " + appProcessInfo.processName); //importance 该进程的重要程度 分为几个级别,数值越低就越重要。 Log.d(TAG, "importance : " + appProcessInfo.importance); // 一般数值大于RunningAppProcessInfo.IMPORTANCE_SERVICE的进程都长时间没用或者空进程了 // 一般数值大于RunningAppProcessInfo.IMPORTANCE_VISIBLE的进程都是非可见进程,也就是在后台运行着 if (appProcessInfo.importance > RunningAppProcessInfo.IMPORTANCE_VISIBLE) { String[] pkgList = appProcessInfo.pkgList; for (int j = 0; j < pkgList.length; ++j) {//pkgList 得到该进程下运行的包名 Log.d(TAG, "It will be killed, package name : " + pkgList[j]); am.killBackgroundProcesses(pkgList[j]); count++; } } } } long afterMem = getAvailMemory(ClearMemoryActivity.this); Log.d(TAG, "----------- after memory info : " + afterMem); Toast.makeText(ClearMemoryActivity.this, "clear " + count + " process, " + (afterMem - beforeMem) + "M", Toast.LENGTH_LONG).show(); } }); } //获取可用内存大小 private long getAvailMemory(Context context) { // 获取android当前可用内存大小 ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE); MemoryInfo mi = new MemoryInfo(); am.getMemoryInfo(mi); //mi.availMem; 当前系统的可用内存 //return Formatter.formatFileSize(context, mi.availMem);// 将获取的内存大小规格化 Log.d(TAG, "可用内存---->>>" + mi.availMem / (1024 * 1024)); return mi.availMem / (1024 * 1024); } }
注意:getRunningAppProcesses()只能获取到自身app应用的信息,如果要获取其他应用的信息,需要将该apk设置为 "android.uid.system" 或系统签名