Android中通过外部程序启动App的三种方法

Intent LaunchIntent = getPackageManager().getLaunchIntentForPackage("com.joyodream.jiji");
                startActivity(LaunchIntent);

Intent intent = new Intent();
                intent.setAction("com.joyodream.jiji.main");
                MainActivity.this.startActivity(intent);
 
<intent-filter>
                <action android:name="com.joyodream.jiji.main" />
                <category android:name="android.intent.category.DEFAULT" />              
            </intent-filter>

Intent intent = new Intent();
                intent.setData(Uri.parse("joyodream://......"));
                startActivity(intent);
 
 
 
<intent-filter>
                <action android:name="android.intent.action.VIEW" />
                <category android:name="android.intent.category.DEFAULT" />
                <data android:scheme="joyodream" android:ssp="jiji" />              
            </intent-filter>