1、首先是界面的UI layout： main.xml（片段）
<Button
Android:text="@string/start_button"
android:id="@+id/startButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
</Button>
<Button
android:text="@string/finish_button"
android:id="@+id/finishButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
</Button>
<TextView
android:id="@+id/statusTextView"
android:layout_width="fill_parent"
android:layout_height="70px"
android:textColor="#FFFFFFFF"
android:textSize="18px"
android:paddingLeft="30px"
android:gravity="center_vertical">
</TextView>
2、Activity代码：
public class TextViewDemo extends Activity {
private TextView statusTextView;
private Drawable statusIcon;
private Drawable arrowIcon;
private LayerDrawable layerDrawable;
private Animation anim_start;
private Animation anim_finish;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
init();
}
private void init(){
Button startButton = (Button)findViewById(R.id.startButton);
startButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
setStartStatus();
}
});
Button finishButton = (Button)findViewById(R.id.finishButton);
finishButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
setFinishStstus();
}
});
statusTextView = (TextView)findViewById(R.id.statusTextView);
statusTextView.setCompoundDrawablePadding(10);
anim_start = AnimationUtils.loadAnimation(this, R.anim.status_view_enter);
anim_finish = AnimationUtils.loadAnimation(this, R.anim.status_view_enter);
statusIcon = zoomDrawable(getResources().getDrawable(R.drawable.status_icon),60, 60) ;
arrowIcon = zoomDrawable(getResources().getDrawable(R.drawable.arrow), 40, 30);
Drawable[] icons = new Drawable[2];
icons[0] = statusIcon;
icons[1] = arrowIcon;
layerDrawable = new LayerDrawable(icons);
layerDrawable.setLayerInset(0, 0, 0, 20, 0);
layerDrawable.setLayerInset(1, 40, 20, 0, 0);
}
private void setStartStatus(){
statusTextView.setText(R.string.start_text);
statusTextView.setCompoundDrawablesWithIntrinsicBounds(layerDrawable.getDrawable(0), null, null, null);
statusTextView.startAnimation(anim_start);
}
private void setFinishStstus(){
statusTextView.setText(R.string.finish_text);
statusTextView.setCompoundDrawablesWithIntrinsicBounds(layerDrawable, null, null, null);
statusTextView.startAnimation(anim_finish);
}
private Drawable zoomDrawable(Drawable drawable, int w, int h)
{
int width = drawable.getIntrinsicWidth();
int height= drawable.getIntrinsicHeight();
// drawable转换成bitmap
Bitmap oldbmp = drawableToBitmap(drawable);
// 创建操作图片用的Matrix对象
Matrix matrix = new Matrix();
// 计算缩放比例
float scaleWidth = ((float)w / width);
float scaleHeight = ((float)h / height);
// 设置缩放比例
matrix.postScale(scaleWidth, scaleHeight);
// 建立新的bitmap，其内容是对原bitmap的缩放后的图
Bitmap newbmp = Bitmap.createBitmap(oldbmp, 0, 0, width, height, matrix, true);
// 把bitmap转换成drawable并返回
return new BitmapDrawable(newbmp);
}