从子活动android回到父活动

时间:2013-09-16 08:46:51

标签: android android-tabactivity

在我的应用程序中,我有一个选项卡,其中包括两个活动,例如1和2.活动1扩展了ActivityGroup,其中有一个子活动说A.现在,场景变为这样, 在第一个标签中 - >活动1及其子活动A. 在第二个标签中 - >活动2.在第一个选项卡的活动1中执行某些功能后,用户将移至第一个选项卡的子活动A.现在我想做什么,当用户从子活动A按回按钮时,用户应该回到其父活动1.如何做到这一点?以下是我的代码..

MainActivity.java

public class MainActivity extends TabActivity {

    TabHost tabHost;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        Resources ressources = getResources(); 
        tabHost = getTabHost(); 

        Intent intentProfile = new Intent().setClass(this, Tab1.class);
        TabSpec tabProfile = tabHost
          .newTabSpec("Profile")
          .setIndicator("Profile", ressources.getDrawable(R.drawable.ic_launcher))
          .setContent(intentProfile);

        Intent intentFriends = new Intent().setClass(this, Tab2.class);
        TabSpec tabFriends = tabHost
          .newTabSpec("Friends")
          .setIndicator("Friends", ressources.getDrawable(R.drawable.ic_launcher))
          .setContent(intentFriends);


        tabHost.addTab(tabProfile);
        tabHost.addTab(tabFriends);

        tabHost.setCurrentTab(0);

    }


    public void switchTabBar(int tab) {
        tabHost.setCurrentTab(tab); 
    }
    @Override
      public void onBackPressed() {
        // Called by children
        MainActivity.this.finish();
        }

}

Tab1.java

public class Tab1 extends ActivityGroup {

    Button btn;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.tab1);
        btn = (Button)findViewById(R.id.button1);
        btn.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {

                Intent in = new Intent(Tab1.this, Second.class);
                replaceContentView("activity3", in);
            }
        });
    }

    public void replaceContentView(String id, Intent newIntent) 
    {
        View view = getLocalActivityManager().startActivity(id,newIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)) .getDecorView(); this.setContentView(view);
    }

     @Override
        public void onBackPressed() {
          this.getParent().onBackPressed();   
        }

}

Second.java

 public class Second extends Activity {

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.second);
        }

        @Override
        public void onBackPressed() {
          this.getParent().onBackPressed();   
          MainActivity parentTab = (MainActivity) this.getParent();
          parentTab.switchTabBar(0);
        }
    }

Tab2.java

public class Tab2 extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.tab2);
    }


    @Override
    public void onBackPressed() {
    // this.getParent().onBackPressed();
         MainActivity parentTab = (MainActivity) this.getParent();
         parentTab.switchTabBar(0);

    }
}

在这里,我可以按下后退按钮上的标签2移动到标签1。但是,我无法从标签1的子活动回到父活动。

2 个答案:

答案 0 :(得分:0)

您必须覆盖父活动中的后退按钮并从子级拨打电话。有关详情,请点击此链接:Navigate Between Activities in an ActivityGroup

答案 1 :(得分:0)

在Tab1中:

    @Override
    public void onBackPressed() {
      super.onBackPressed();   
    }

    @Override
    public void onPause() 
    {
      super.onPause();
       finish();
    }
Tab1中的