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[操作系统]隐式启动判断是否有匹配的Intent


一、PackageManager的resolveActivity

 public abstract ResolveInfo resolveActivity(Intent intent, int flags);

getPackageManager().resolveActivity();

 

返回能够匹配的Intent,如果不能匹配就返回NULL,

二、PackageManager的queryIntentActivities

public abstract List<ResolveInfo> queryIntentActivities(Intent intent,    int flags);

getPackageManager().queryIntentActivities(intent,PackageManager.MATCH_DEFAULT_ONLY);

 

返回所有成功匹配的Activity信息

三、Intent的resolveActivity

 public ComponentName resolveActivity(PackageManager pm)

Intent intent = new Intent();    ComponentName componentName = intent.resolveActivity();

 

第一个参数代表Intent

第二个参数:设置PackageManager.MATCH_DEFAULT_ONLY