Question

从A活动到B活动，B到c，但是当回到A并点击后退按钮时，需要三次点击事件返回。我在onbackpressed方法中调用了finish（）方法，看起来finish（）方法工作不正常或者是其他任何原因，任何帮助都会受到赞赏

这是我的代码

public class A extends Activity {
TextView text_whatsapp;
ImageView image_whatsapp;

@Override
protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.about_whatsapp);

    text_whatsapp = (TextView) findViewById(R.id.text_whatsapp);
    image_whatsapp = (ImageView) findViewById(R.id.image_whatsapp);

}

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

}

    public class B extends Activity {
    TextView text_whatsapp;
    ImageView image_whatsapp;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.availability);



    }

    @Override
    public void onBackPressed() {
        startActivity(new Intent(B.this, A.class));
        super.onBackPressed();
    }
}



public class C extends Activity {
TextView text_whatsapp;
ImageView image_whatsapp;

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.c);



}

@Override
public void onBackPressed() {
    startActivity(new Intent(C.this, B.class));
    super.onBackPressed();
}

}

Answer 1

在活动C中使用如下。

@Override
public void onBackPressed() {
    super.onBackPressed();
    startActivity(new Intent(C.this, B.class));
    finish();

}

在活动B中使用如下。

@Override
public void onBackPressed() {     
    super.onBackPressed();
    startActivity(new Intent(B.this, A.class));
    finish();
}

在活动A中使用如下。

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

}

Answer 2

当你从A到B再到B到C时调用完成然后它不会让你按3退出应用程序

从A活动到B活动，从B到c，但是当回到A并点击后退按钮时，需要三次点击事件返回

2 个答案: