Android

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1.卸载应用的Intent

卸载请求Intent intent = new Intent();intent.setAction("android.intent.action.DELETE");intent.addCategory("android.intent.category.DEFAULT");intent.setData(Uri.parse("package:"+clickedAppInfo.getPackName()));startActivity(intent);安装请求Intent intent = new Intent();intent.setAction("android.intent.action.VIEW");intent.addCategory("android.intent.category.DEFAULT");intent.setDataAndType(        Uri.fromFile(new File(apk_path)),        "application/vnd.android.package-archive");startActivity(intent);

2.接收卸载应用程序的广播

AppUninstallReceiver receiver = new AppUninstallReceiver();IntentFilter filter = new IntentFilter();filter.addAction(Intent.ACTION_PACKAGE_REMOVED);filter.addDataScheme("package");registerReceiver(receiver, filter);
  • 相关广播
  • ACTION_PACKAGE_ADDED 一个新应用包已经安装在设备上,数据包括包名(最新安装的包程序不能接收到这个广播)
  • ACTION_PACKAGE_REPLACED 一个新版本的应用安装到设备,替换之前已经存在的版本
  • ACTION_PACKAGE_REMOVED 一个已存在的应用程序包已经从设备上移除,包括包名(正在被卸载的包程序不能接收到这个广播)

3.遍历集合时如何删除数据

方法一:高级for循环,记录要删除的数据,遍历后再删除AppInfo deleteAppInfo = null;//更新ui界面for(AppInfo appinfo: userAppInfos){    if(appinfo.getPackName().equals(packname)){        deleteAppInfo = appinfo;    }}if(deleteAppInfo!=null){    userAppInfos.remove(deleteAppInfo);}方法二:使用迭代器进行遍历,可在遍历中删除Iterator<AppInfo> iterator = userAppInfos.iterator();while(iterator.hasNext()){    AppInfo appinfo = iterator.next();    if (appinfo.getPackName().equals(packname)) {        iterator.remove();    }}方法三:使用普通for循环倒叙,可在遍历中删除。注意:如不采用倒叙,会遍历不全for (int i = userAppInfos.size() - 1; i >= 0; i--) {    AppInfo appinfo = userAppInfos.get(i);    if (appinfo.getPackName().equals(packname)) {        userAppInfos.remove(i);        break;    }}

4.启动一个应用程序

PackageManager pm = getPackageManager();Intent intent = pm.getLaunchIntentForPackage(clickedAppInfo.getPackName());if(intent!=null){    startActivity(intent);}else{    Toast.makeText(this, "对不起,该应用无法被开启", 0).show();}

5.分享

Intent intent = new Intent();intent.setAction("android.intent.action.SEND");intent.addCategory("android.intent.category.DEFAULT");intent.setType("text/plain");intent.putExtra(Intent.EXTRA_TEXT, "推荐你使用一款软件:"+clickedAppInfo.getAppName()+",真的很好用哦");startActivity(intent);

6.详细信息

Intent intent = new Intent("android.settings.APPLICATION_DETAILS_SETTINGS");intent.addCategory(Intent.CATEGORY_DEFAULT);intent.setData(Uri.parse("package:"+clickedAppInfo.getPackName()));startActivity(intent);

7.设备进程信息获取

获取设备运行进程ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);List<RunningAppProcessInfo> runningAppProcessInfos = am.getRunningAppProcesses();获取设备RAMMemoryInfo outInfo = new ActivityManager.MemoryInfo();am.getMemoryInfo(outInfo);outInfo.availMem;//设备可用RAMoutInfo.totalMem;//设备总RAM

8.获取进程占用RAM

ActivityManager am = (ActivityManager) context            .getSystemService(Context.ACTIVITY_SERVICE);MemoryInfo[] processMemoryInfo = am.getProcessMemoryInfo(new int[]{info.pid});long memSize = processMemoryInfo[0].getTotalPrivateDirty()*1024;

9.ListView中Item中有CheckBox、Button等的焦点处理

ListView的item布局中有CheckBox、Button等会获取焦点的控件会抢走焦点,造成ListView的item点击事件相应不了

解决方法:控件设置

android:clickable="false"android:focusable="false"

或者

android:focusable="false"//descendant 后裔; 后代; (由过去类似物发展来的) 派生物; 弟子; android:descendantFocusability="blocksDescendants"

10.ListView中getItemAtPosition()的使用

ListView的getItemAtPosition()方法的返回值即为adapter中getItem()方法返回的对象

11.清理进程

1.添加权限<uses-permission android:name="android.permission.KILL_BACKGROUND_PROCESSES" />2.具体实现ActivityManager am = (ActivityManager) getSystemService(ACTIVITY_SERVICE);am.killBackgroundProcesses(String pkgName);