在Android中的选项卡中启动活动

Question

这是交易.我有一个带有三个标签的应用程序.通过与选项卡中的项目的各种交互,我最终启动了其他活动.客户审查这一点,并希望推出的"内"选项卡中的活动,这样的标签仍然可见,如果用户点击标签它可以追溯到在setContent函数中定义的原始活动.这是可能的,我将如何从其他活动中解决这个问题？(即子活动,而不是定义TabHost并有权调用setContent的那个)？

Answer 1

可以在选项卡中启动活动.因此,将tabspec内容设置为ActivityGroup而不是常规Activity.

tabHost.addTab(tabHost.newTabSpec("Tab")
                .setIndicator("Tab")
                .setContent(new Intent(this, YourActivityGROUP.class)
                 .addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)));

然后,您可以从该ActivityGroup中启动另一个此类活动,该活动仅更新您所在选项卡的内容视图.

class YourActivityGROUP extends ActivityGroup{

@Override
protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);

      //you van get the local activitymanager to start the new activity

      View view = getLocalActivityManager()
                                .startActivity("ReferenceName", new
      Intent(this,YourActivity.class)
                                .addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP))
                                .getDecorView();
       this.setContentView(view);

   }
}

Answer 2

这是我的解决方案

public class ActivityStack extends ActivityGroup {

  private Stack<String> stack;

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    if (stack == null) stack = new Stack<String>();
    //start default activity
    push("FirstStackActivity", new Intent(this, FirstStackActivity.class));
  }

  @Override
  public void finishFromChild(Activity child) {
    pop();
  }

  @Override
  public void onBackPressed() {
    pop();
  }


  public void push(String id, Intent intent) {
    Window window = getLocalActivityManager().startActivity(id, intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP));
    if (window != null) {
      stack.push(id);
      setContentView(window.getDecorView());
    }
  }

  public void pop() {
    if (stack.size() == 1) finish();
    LocalActivityManager manager = getLocalActivityManager();
    manager.destroyActivity(stack.pop(), true);
    if (stack.size() > 0) {
      Intent lastIntent = manager.getActivity(stack.peek()).getIntent();
      Window newWindow = manager.startActivity(stack.peek(), lastIntent);
      setContentView(newWindow.getDecorView());
    }
  }
}

启动标签

Intent intent = new Intent().setClass(this, ActivityStack.class);
TabHost.TabSpec spec = tabHost.newTabSpec("tabId")
spec.setContent(intent);

拨打下一个活动

public class FirstStackActivity extends Activity {
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    TextView textView = new TextView(this);
    textView.setText("First Stack Activity ");
    textView.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View v) {
          Intent intent = new Intent();
          intent.setClass(getParent(), SecondStackActivity .class);
          ActivityStack activityStack = (ActivityStack) getParent();
          activityStack.push("SecondStackActivity", intent);


      }
    });
    setContentView(textView);
  }
}

再次拨打电话

public class SecondStackActivity extends Activity {
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    TextView textView = new TextView(this);
    textView.setText("First Stack Activity ");
    textView.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View v) {
          Intent intent = new Intent();
          intent.setClass(getParent(), ThirdStackActivity .class);
          ActivityStack activityStack = (ActivityStack) getParent();
          activityStack.push("ThirdStackActivity", intent);


      }
    });
    setContentView(textView);
  }
}

适用于模拟器2.2