android

Question

我是 android 的新手。我正在开发一个应用程序。我有一个 textView 作为 header 和一个 horizontal_scroll_view 的内容。现在，当我按下 textView 时，我需要 horizontal_scroll_view 弹出 header。

XML布局-

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:paddingLeft="20dp"
                android:paddingStart="20dp"
                android:onClick="DailyUseItems"
                android:clickable="true"
                android:text="Daily Use Products"
                android:textColor="#FFFFFF"
                android:textSize="24sp" />



        <HorizontalScrollView xmlns:android="http://schemas.android.com/apk/res/android"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="#EEEEEE"
            android:id="@+id/daily_use_items"
            android:scrollbars="none">
        </HorizontalScrollView>

Answer 1

如果您希望将其显示为弹出窗口，您可以制作自定义对话框 https://developer.android.com/guide/topics/ui/dialogs.html But If you would like to make HorizontalScrollView invisible and make it visible on header click you can set in xml android:visibility="invisible" or android:visibility="gone" and then in java click listener horizontalScrollView.setVisibility(View.VISIBLE); To make it popup/slide down the header you would need to use android animation. Here is how I would do it, based on this code https://gist.github.com/rafali/5146957:

MainActivity.class

public class MainActivity extends AppCompatActivity {

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

    final HorizontalScrollView hsc = (HorizontalScrollView) findViewById(R.id.daily_use_items);
    TextView tv = (TextView) findViewById(R.id.header);

    hsc.setAlpha(0.0f);

    tv.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            hsc.animate().alpha(1.0f);
            ResizeAnimation resizeAnimation = new ResizeAnimation(hsc,hsc.getHeight());
            resizeAnimation.setDuration(600);
            hsc.startAnimation(resizeAnimation);
        }
    });
}
}

ResizeAnimation.class

public class ResizeAnimation extends Animation {
final int startHeight;
final int targetHeight;
View view;

public ResizeAnimation(View view, int targetHeight) {
    this.view = view;
    this.targetHeight = targetHeight;
    startHeight = 0;
}

@Override
protected void applyTransformation(float interpolatedTime, Transformation t) {
    int newHeight = (int) (startHeight + (targetHeight - startHeight) * interpolatedTime);
    view.getLayoutParams().height = newHeight;
    view.requestLayout();

}

@Override
public void initialize(int width, int height, int parentWidth, int parentHeight) {
    super.initialize(width, height, parentWidth, parentHeight);
}

@Override
public boolean willChangeBounds() {
    return true;
}
}

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