Android单击按钮

Question

我有两个活动a和title bar隐藏的活动B。我不想使用navutils.navigateupfromsametask。我可以从"活动"到活动b上的按钮单击。我需要在不使用意图的情况下导航回活动A。

activity_a.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
    <Button
        android:id="@+id/button1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Go to Activity B" />
</LinearLayout>

activity_b.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<Button
    android:id="@+id/button2"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="Go Back to Activity A" />
</LinearLayout>

activity_a.java

Button button1 = (Button) findViewById(R.id.button1);
button1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
        Intent intent = new Intent(context, Activity_B.class);
        startActivity(intent);
        }
        });

activity_b.java

   protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            this.requestWindowFeature(Window.FEATURE_NO_TITLE);
            setContentView(R.layout.Avtivity_B);
    Button button2 = (Button) findViewById(R.id.button2);
        button2.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View arg0) {
              --> Code to Navigate up to Activity A <--   
                }
       });
  }

我隐藏了标题栏，我不想使用navutils或意图。

Answer 1

这样做的一种方法只是调用finish()方法。在您的Activity_B.java中：

@Override
    public void onClick(View arg0) {
        finish();
    }

Answer 2

您也可以在buttonClick上调用活动的onBackPressed()

button.setOnClickListener(new View.OnClickListener(){
    @Override
    public void onClick(View arg0) {
          onBackPressed();
     }
});