Android Activity与Fragment之间的跳转实例详解
投稿:lqh
这篇文章主要介绍了Android Activity与Fragment之间的跳转实例详解的相关资料,需要的朋友可以参考下
Activity及Fragment之间的跳转
直接跳转
基本使用方法
public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } public void jump(View view) { Intent intent = new Intent(this, VideoPlayActivity.class); intent.putExtra("video_id", "1"); startActivity(intent); } }
public class VideoPlayActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_video_play); Intent intent = getIntent(); } }
借助工具类
然而并没什么卵用
public static void startActivity(Context context, Class clazz,Bundle data) { Intent intent = new Intent(context, clazz); if(data != null){ intent.putExtras(data); } context.startActivity(intent); }
推荐方案
- 把new Intent()放在目标Activity,这样可以onCreate里的getIntent形成对应
- 更容易理解和管理一个出口,多个入口的情况
- 较方便维护传递数据的key和value(即key由目标Activity来定义,value是实际的来源)
public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } public void jump(View view) { startActivity(VideoPlayActivity.newIntent(this, "1")); } }
public class VideoPlayActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_video_play); } public static Intent newIntent(Context context, String vid) { Intent intent = new Intent(context, VideoPlayActivity.class); intent.putExtra("video_id", vid); return intent; } }
Fragment跳转
- 首先需要一个空的构造方法,Fragment恢复重建要使用。
- 使用newInstance代替构造方法传参
- 在Fragment.onCreate方法获取实参
public class MainFragment{ public MainFragment() { // Required empty public constructor } public static MainFragment newInstance(int pos) { MainFragment fragment = new MainFragment(); Bundle args = new Bundle(); args.putInt("pos", pos); fragment.setArguments(args); return fragment; } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); if (getArguments() != null) { pos = getArguments().getInt("pos"); } } }
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