java - onBack按回到主屏幕

Question

当我回按时，我希望该选项卡有一个条件，它会在“主页”选项卡上显示，但当我回按时，所有 Activity 都会结束。

这是我的代码。尝试帮助我。

 backpressed = true;

   if (results.equals("HOME")) {
        mTabHost.setCurrentTab(0);
        backpressed = false;
    } else if (results.equals("B")) {
        mTabHost.setCurrentTab(2);
    } else if (results.equals("C")) {
        mTabHost.setCurrentTab(3);
    } else if (results.equals("D")) {
        mTabHost.setCurrentTab(1);
    } else if (results.equals("E")) {

        singleton.openNewsFeed = true;
        mTabHost.setCurrentTab(4);
    } else {
        singleton.openMessage = true;
        mTabHost.setCurrentTab(4);
    }

这是我的 onBackPressed

 @Override
public void onBackPressed() {
    /*super.onBackPressed();*/

    if (backpressed == true) {
        Intent intent = new Intent(getApplicationContext(), Dashboard.class);
        intent.putExtra("result", "HOME"); // getText() SHOULD NOT be static!!!
        startActivity(intent);
    }else{
        //FINISH
       super.onBackPressed();
    }

}

Answer 1

这里的条件有误

你应该尝试一下

 backpressed = false;

   if (results.equals("HOME")) {
        mTabHost.setCurrentTab(0);
        backpressed = true;
    } else if (results.equals("B")) {
        mTabHost.setCurrentTab(2);
    } else if (results.equals("C")) {
        mTabHost.setCurrentTab(3);
    } else if (results.equals("D")) {
        mTabHost.setCurrentTab(1);
    } else if (results.equals("E")) {

        singleton.openNewsFeed = true;
        mTabHost.setCurrentTab(4);
    } else {
        singleton.openMessage = true;
        mTabHost.setCurrentTab(4);
    }

背面按下

 @Override
public void onBackPressed() {
    /*super.onBackPressed();*/

    if (backpressed == true) {
        Intent intent = new Intent(getApplicationContext(), Dashboard.class);
        intent.putExtra("result", "HOME"); // getText() SHOULD NOT be static!!!
        startActivity(intent);
    }else{
        //FINISH
       //super.onBackPressed();
       mTabHost.setCurrentTab(0);
    }

}