每日学习总结<二> 2015-9-1

 1 public String getMemoryState(Context context) {
 2 
 3         ActivityManager activityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
 4         ActivityManager.MemoryInfo info = new ActivityManager.MemoryInfo();
 5         activityManager.getMemoryInfo(info);
 6 //                Log.e(MainActivity.TAG, "剩余内存" + (info.availMem >> 100000) + "M");
 7         Log.e(MainActivity.TAG, "是否处于低内存：" + info.lowMemory);
 8         Log.e(MainActivity.TAG, "threshold: " + info.threshold);
 9         memoryValueLong = (info.availMem / 1048576);
10         memoryValueString = Long.toString(memoryValueLong);
11         Log.e(MainActivity.TAG, "可用内存: " + memoryValueString + "MB");
12 
13         return memoryValueString;
14     }
15 
16     public long getMemoryValueLong(Context context) {
17         ActivityManager activityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
18         ActivityManager.MemoryInfo info = new ActivityManager.MemoryInfo();
19         activityManager.getMemoryInfo(info);
20 //                Log.e(MainActivity.TAG, "剩余内存" + (info.availMem >> 100000) + "M");
21         Log.e(MainActivity.TAG, "是否处于低内存：" + info.lowMemory);
22         Log.e(MainActivity.TAG, "threshold: " + info.threshold);
23         memoryValueLong = (info.availMem / 1048576);
24         return memoryValueLong;
25     }
26 
27     public void killProcess() {
28         ActivityManager activityManager2 = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
29         List<ActivityManager.RunningAppProcessInfo> infoList = activityManager2.getRunningAppProcesses();
30         List<ActivityManager.RunningServiceInfo> serviceInfoList = activityManager2.getRunningServices(200);
31         long beforeMem = getMemoryValueLong(MainActivity.this);
32         Log.d(TAG, "-----------before memory info : " + beforeMem);
33         int count = 0;
34         if (infoList != null) {
35             for (int i = 0; i < infoList.size(); ++i) {
36                 ActivityManager.RunningAppProcessInfo appProcessInfo = infoList.get(i);
37                 Log.e(TAG, "process name : " + appProcessInfo.processName);
38                 //importance 该进程的重要程度  分为几个级别，数值越低就越重要。
39                 Log.e(TAG, "importance : " + appProcessInfo.importance);
40                 // 一般数值大于RunningAppProcessInfo.IMPORTANCE_SERVICE的进程都长时间没用或者空进程了
41                 // 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
42                 if (appProcessInfo.importance > ActivityManager.RunningAppProcessInfo.IMPORTANCE_SERVICE) {
43                     String[] pkgList = appProcessInfo.pkgList;
44                     for (int j = 0; j < pkgList.length; ++j) {
45                         Log.e(MainActivity.TAG, "Killed package name: " + pkgList[j]);
46                         activityManager2.killBackgroundProcesses(pkgList[j]);
47                         count++;
48 
49                     }
50                 }
51 
52                 long clearAfeterMemoryState = getMemoryValueLong(MainActivity.this);
53                 Toast.makeText(MainActivity.this, "已清理内存：" + Long.toString(beforeMem - clearAfeterMemoryState) + " 当前内存为：  " + Long.toString(clearAfeterMemoryState), Toast.LENGTH_SHORT).show();
54             }
55 
56 
57         }
58     }

private void addShortCut() {
    Log.e(MainActivity.TAG, "====addShortCut()====");

    Intent shortCutIntent = new Intent("com.android.launcher.action.INSTALL_SHORTCUT");
    //快捷方式名称
    shortCutIntent.putExtra(Intent.EXTRA_SHORTCUT_NAME, getString(R.string.app_name));
    shortCutIntent.putExtra("duplicate", false);

    ComponentName componentName = new ComponentName(this.getPackageName(), "." + this.getLocalClassName());
    shortCutIntent.putExtra(Intent.EXTRA_SHORTCUT_NAME, new Intent(Intent.ACTION_MAIN).setComponent(componentName));

    //快捷方式的图标
    Intent.ShortcutIconResource iconResource = new Intent.ShortcutIconResource().fromContext(this, R.drawable.ic_launcher);
    shortCutIntent.putExtra(Intent.EXTRA_SHORTCUT_ICON_RESOURCE, iconResource);
    sendBroadcast(shortCutIntent);

}