android 圖標如何閃爍

由於項目需要，需要點擊後圖標閃爍，嘗試animation-list發現很多機型不支持，後面利用線程的方法幹了它

1 不用自定義控件的方案

1、準備好1個圖標，用來閃爍時顯示的
2、建立線程
java
Thread thread=new Thread(){
@Override
public void run() {
while (true){
// isBreak 用來控制線程關閉
//timecount 實現交替顯示
if (isBreak){break;}
timecount++;
timecount%=2;
handler.sendMessage(new Message());
try {
sleep(500);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
};

3、因爲UI改變應該在UI線程裏面進行，所以，用Handler 改變UI
Java
Handler handler=new Handler(){
@Override
public void handleMessage(Message msg) {
if(timecount==0){
view.setBackgroundResource(R.id.a);
}
else{
view.setBackgroundResource(R.id.b);
}
}
};

4、記得在ondestory 裏面釋放線程,將isBreak 設爲true

2 自定義控件

利用canvas繪圖時來選擇選中和隱藏，效果很不錯
““Java
public class ClickableSparkView extends View {
private Context mContext;

public ClickableSparkView(Context context) {
    super(context);
    iniView(context);
}

public ClickableSparkView(Context context, AttributeSet attrs) {
    super(context, attrs);
    iniView(context);
}

public ClickableSparkView(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
    iniView(context);
}
public void iniView(Context context){
    mContext=context;
    thread.start();
}

@Override

public void setSelected(boolean selected) {
super.setSelected(selected);
//在Activity中，點擊時改變select狀態
invalidate();
}

@Override

protected void onDetachedFromWindow() {
//釋放線程
super.onDetachedFromWindow();
isBreak=true;
}

private boolean isBreak=false;
Thread thread=new Thread(){
    @Override

public void run() {
while (true){
if (isBreak){break;}
timecount++;
timecount%=2;
handler.sendMessage(new Message());
try {
sleep(500);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
};
Handler handler=new Handler(){
@Override
public void handleMessage(Message msg) {
invalidate();

    }
};
private int timecount=0;
@Override

protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
int height = canvas.getHeight();
int width=canvas.getWidth();
Paint paint=new Paint();
paint.setStyle(Paint.Style.STROKE);
paint.setStrokeWidth((float)width/ 40);
paint.setStrokeCap(Paint.Cap.ROUND);
if (isSelected()){
if (timecount==0) {
canvas.drawLine(width / 2, 0, width / 2, height, paint);
}
}else {

    }
}

}
““