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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