android 检查是否安装成功,android开发中,判断是否安装了qq

Android系统中，判断应用有无安装有两种方式：

1.根据包名判断,以下为判断代码：

public boolean checkApkExist(Context context, String packageName) {

if (packageName == null || “”.equals(packageName))

return false;

try {

ApplicationInfo info = context.getPackageManager()

.getApplicationInfo(packageName,

PackageManager.GET_UNINSTALLED_PACKAGES);

return true;

} catch (NameNotFoundException e) {

return false;

}

}

2. 根据Intent判断，以下为判断代码：

public boolean checkApkExist(Context context, Intent intent) {

List list = context.getPackageManager().queryIntentActivities(intent, 0);

if(list.size() > 0){

return true;

}

return false;

}

public boolean checkApkExist(Context context, String packageName) {

if (packageName == null || “”.equals(packageName)) return false;

try {

ApplicationInfo info = context.getPackageManager() .getApplicationInfo(packageName, PackageManager.GET_UNINSTALLED_PACKAGES); return true;

} catch (NameNotFoundException e) { return false; }

}

public boolean checkApkExist(Context context, Intent intent) {

List list = context.getPackageManager()

.queryIntentActivities(intent, 0);

if (list.size() > 0) {

return true;

}

return false;

}

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