Question

我有一个带有src的ImageView，我想让它改变它的src onClick。这很简单，但我想在用户再次点击imageview时将其更改为正常状态。我怎样才能在java中创建它？

修改

我已经尝试过了：

    public void act1 (View view) {
    ImageView ic1 = (ImageView) findViewById(R.id.id1);

    Drawable oldBg = ic1.getBackground();
    String oldBgStr = ic1.getBackground().toString();

    Drawable ic1light = this.getResources().getDrawable(R.drawable.ic1);
    Drawable ic1dark = this.getResources().getDrawable(R.drawable.ic1dark);

    ic1.setTag(R.drawable.ic1);

    if (oldBg == ic1light){
        ic1.setBackground(ic1dark);
    }
    if (oldBg == ic1dark) {
        ic1.setBackground(ic1light);
    }

    ic1.setImageResource(R.drawable.ic1dark);
}

以下是ImageView和布局的XML：

<LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            android:layout_gravity="center"
            android:layout_marginTop="5dp"
            android:background="@color/red"
            >

            <ImageView
            android:id="@+id/id1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:onClick="act1"
            android:background="@drawable/ic1"
            android:adjustViewBounds="true"/>

Answer 1

只需设置一个布尔值，并在用户点击图片时切换它。每次检查布尔值并显示相应的图像。

private boolean mClicked = false;

public void act1 (View view) {
    if(mClicked) {
        ic1.setBackground(ic1dark);
    }
    else {
        ic1.setBackground(ic1light);
    }

    mClicked = !mClicked;
}

Answer 2

使用布尔值在当前图像集的状态之间切换，如下所示：

 private boolean currentState = false;

 public void act1 (View view) {
    ImageView ic1 = (ImageView) findViewById(R.id.id1);

    // set current src


    Drawable oldBg = ic1.getBackground();
    String oldBgStr = ic1.getBackground().toString();

    Drawable ic1light = this.getResources().getDrawable(R.drawable.ic1);
    Drawable ic1dark = this.getResources().getDrawable(R.drawable.ic1dark);

    ic1.setTag(R.drawable.ic1);

    // when this is called from click event of anything else
    if(currentState){
        ic1.setBackground(ic1light);
        currentState = true;
        return;
    }

    if(!currentState){
        ic1.setBackground(ic1dark);
        currentState = false;
        return;
    }

  }

如何在重新点击时更改imageview的src

2 个答案: