在看到有关此功能的许多问题并尝试遵循答案后,我想知道是否有更清晰的示例?
编辑:我试图制作一个大按钮,其中包含“中间”的图像和文本。它必须表现得像一个按钮(StateList drawable),并且图像/文本对应该分组并居中(作为一个组)
如果您喜欢带有图像 + 文本的 Button,那么为什么不使用CompoundDrawable呢?
例如:
为了节省其他人一些时间,我提供以下内容:
布局/some_layout.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
android:id="@+id/menu_ok"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
<!-- StateList Drawable to make it look like a button -->
android:background="@drawable/btn_std_holo_states"
<!-- Required so you can click on it like a button -->
android:clickable="true"
<!-- Recommended min height from the guidelines -->
android:minHeight="48dp"
<!-- OnClickEvent definition -->
android:onClick="onClickOk" >
<!-- Compound drawable of graphic and text -->
<TextView
android:id="@+id/txt_ok"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
<!-- Center both the graphic and text inside the button -->
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
<!-- Draw the graphic to the left of the text -->
android:drawableLeft="@drawable/ic_ok"
<!-- Space between the graphic and the text-->
android:drawablePadding="16dp"
<!-- ensures the text and graphic are both centered vertically -->
android:gravity="center"
<!-- Text of the button -->
android:text="@android:string/ok"
<!-- Change the font to match the standard button settings (optional) -->
android:textAppearance="?android:attr/textAppearanceButton" />
</RelativeLayout>
drawable/btn_std_holo_states.xml(上面引用过)
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@drawable/abs__btn_cab_done_pressed_holo_dark" android:state_pressed="true"/>
<item android:drawable="@drawable/abs__btn_cab_done_focused_holo_dark" android:state_enabled="true" android:state_focused="true"/>
<item android:drawable="@android:color/transparent" android:state_enabled="true"/>
<item android:drawable="@android:color/transparent"/>
</selector>
注意:这里不同的 @drawable 和 @android:color 设置可以是任何东西,只是为了做一个完整的例子而提供
试试这个自定义的 Drawable:
class BackgroundDrawable extends StateListDrawable {
private StateListDrawable mDrawable;
private Bitmap mBitmap;
private Matrix mMatrix;
private boolean mScale;
private int mGravity;
private int mDx;
private int mDy;
public BackgroundDrawable(StateListDrawable sld, Resources res, int resId, boolean scale, int gravity, int dx, int dy) {
mDrawable = sld;
mBitmap = BitmapFactory.decodeResource(res, resId);
mMatrix = new Matrix();
mScale = scale;
mGravity = gravity;
mDx = dx;
mDy = dy;
}
public static void setupBackground(View v, int resId, boolean scale, int gravity, int horizontalPadding, int verticalPadding) {
Drawable d = v.getBackground();
if (d instanceof StateListDrawable) {
StateListDrawable sld = (StateListDrawable) d;
Drawable drawable = new BackgroundDrawable(sld, v.getResources(), resId, scale, gravity, horizontalPadding, verticalPadding);
v.setBackgroundDrawable(drawable);
}
}
@Override
protected boolean onStateChange(int[] stateSet) {
invalidateSelf();
return super.onStateChange(stateSet);
}
@Override
protected void onBoundsChange(Rect bounds) {
mDrawable.setBounds(bounds);
Rect b = new Rect(bounds);
b.inset(mDx, mDy);
RectF src = new RectF(0, 0, mBitmap.getWidth(), mBitmap.getHeight());
RectF dst = new RectF(b);
float[] values = new float[9];
if (mScale) {
mMatrix.setRectToRect(src, dst, ScaleToFit.START);
}
mMatrix.getValues(values);
float sx = values[Matrix.MSCALE_X];
float sy = values[Matrix.MSCALE_Y];
Rect outRect = new Rect();
Gravity.apply(mGravity, (int) (src.width() * sx), (int) (src.height() * sy), b, outRect);
mMatrix.postTranslate(outRect.left, outRect.top);
}
@Override
public void draw(Canvas canvas) {
int[] stateSet = getState();
mDrawable.setState(stateSet);
mDrawable.draw(canvas);
canvas.drawBitmap(mBitmap, mMatrix, null);
}
}
以及如何使用它:
Button b0 = (Button) findViewById(R.id.b0);
BackgroundDrawable.setupBackground(b0, R.drawable.ic_launcher, false, Gravity.BOTTOM | Gravity.RIGHT, 10, 5);
Button b1 = (Button) findViewById(R.id.b1);
BackgroundDrawable.setupBackground(b1, R.drawable.ic_launcher, false, Gravity.TOP, 0, 0);
试试这个:
Drawable appImg = getApplicationContext().getResources().getDrawable( R.drawable.ic_launcher );
appImg.setBounds( 0, 0, appImg.getIntrinsicHeight(), appImg.getIntrinsicWidth() );
Button btn_ok = (Button) findViewById(R.id.ok);
btn_ok.setCompoundDrawables( null, null, appImg, null );
希望它可以帮助你。
谢谢。