隱式啓動判斷是否有匹配的Intent

1、PackageManager的resolveActivity

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

getPackageManager().resolveActivity（）;

 

返回可以匹配的Intent，若是不能匹配就返回NULL，

2、PackageManager的queryIntentActivities

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

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

 

返回全部成功匹配的Activity信息

3、Intent的resolveActivity

 public ComponentName resolveActivity(PackageManager pm)

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

 

第一個參數表明Intent

第二個參數：設置PackageManager.MATCH_DEFAULT_ONLY