判斷Android應用是否安裝、運行

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本文介紹3個方法，判斷手機上是否安裝了某應用、該應用是否正在運行、擷取手機某個APK檔案的安裝Intent.啟動該Intent就可以直接安裝該APK。

/**
* 判斷應用是否已安裝
*
* @param context
* @param packageName
* @return
*/
private boolean isInstalled(Context context, String packageName) {
boolean hasInstalled = false;
PackageManager pm = context.getPackageManager();
List<PackageInfo> list = pm
.getInstalledPackages(PackageManager.PERMISSION_GRANTED);
for (PackageInfo p : list) {
if (packageName != null && packageName.equals(p.packageName)) {
hasInstalled = true;
break;
}
}
return hasInstalled;
}

/**
* 擷取檔案安裝的Intent
*
* @param file
* @return
*/
private Intent getFileIntent(File file) {
Uri uri = Uri.fromFile(file);
String type = "application/vnd.android.package-archive";
Intent intent = new Intent("android.intent.action.VIEW");
intent.addCategory("android.intent.category.DEFAULT");
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setDataAndType(uri, type);
return intent;
}

/**
* 判斷應用是否正在運行
*
* @param context
* @param packageName
* @return
*/
private boolean isRunning(Context context, String packageName) {
ActivityManager am = (ActivityManager) context
.getSystemService(Context.ACTIVITY_SERVICE);
List<RunningAppProcessInfo> list = am.getRunningAppProcesses();
for (RunningAppProcessInfo appProcess : list) {
String processName = appProcess.processName;
if (processName != null && processName.equals(packageName)) {
return true;
}
}
return false;
}

判斷Android應用是否安裝、運行