跳转到其他APP的非主Activity

            Intent intent = new Intent();
            ComponentName comp = new ComponentName("com.---.---", "com.---.---.activity.OtherActivity");
            intent.setComponent(comp);
            intent.putExtra("other", "true");
            intent.setAction("android.intent.action.VIEW");
            startActivity(intent);

需要其他app的activity支持被跳转

android:name=".activity.OtherActivity"
android:exported="true"//必须有这句话
android:screenOrientation="landscape">

//通过action跳转