Android0918（自定義View的屬性，下載顯示球）
阿新 • • 發佈：2019-01-11
自定義View的屬性
myview_attr.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="myview">
<attr name="myviewbackground" format="reference"></attr>
<attr name="myviewpaintwidth" format="dimension|reference"></attr>
</declare-styleable activity_bitmapview.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:myview="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent" MyBitmapView.java
public class MyBitmapView extends View {
private int width;
private int height;
private Paint mPaintCircle;
private Paint mPaintRect;
private Bitmap mBitmap;
private Canvas canvasBit;
private Bitmap bitmapBackground;
private Matrix matrix;
public MyBitmapView(Context context) {
super(context);
}
public MyBitmapView(Context context, AttributeSet attrs) {
super(context, attrs);
final TypedArray a=context.obtainStyledAttributes(attrs,R.styleable.myview);
BitmapDrawable dra= (BitmapDrawable) a.getDrawable(R.styleable.myview_myviewbackground);
if (dra!=null){
bitmapBackground=dra.getBitmap();
}else{
bitmapBackground= BitmapFactory.decodeResource(getResources(), R.mipmap.smallgirl);
}
int paintWidth=a.getDimensionPixelOffset(R.styleable.myview_myviewpaintwidth,10);
mPaintCircle=new Paint();
mPaintCircle.setColor(Color.GREEN);
mPaintRect=new Paint();
mPaintRect.setColor(Color.GREEN);
mPaintRect.setStrokeCap(Paint.Cap.ROUND);//設定線段開頭的填充形狀,
//設定結合處的樣子 Miter:結合處為銳角， Round:結合處為圓弧：BEVEL：結合處為直線。
mPaintRect.setStrokeJoin(Paint.Join.ROUND);//設定線段的中間填充形狀
mPaintRect.setStrokeWidth(paintWidth);
mPaintRect.setStyle(Paint.Style.FILL_AND_STROKE);
//是用來控制繪製輪廓(線條)的方式，一般new一個具體的子類傳入。
//CornerPathEffect：這個類的作用就是將Path的各個連線線段之間的夾角//用一種更平滑的方式連線，類似於圓弧與切線的效果。
//DiscretePathEffect：這個類的作用是打散Path的線段，使得在原來路徑//的基礎上發生打散效果。
//PathDashPathEffect：這個類的作用是使用Path圖形來填充當前的路徑。
mPaintRect.setPathEffect(new CornerPathEffect(360));
mPaintRect.setAntiAlias(true);//消鋸齒
PorterDuffXfermode modeXOR=new PorterDuffXfermode(PorterDuff.Mode.XOR);
mPaintRect.setXfermode(modeXOR);
matrix=new Matrix();
path=new Path();
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
width=getDefaultSize(getSuggestedMinimumWidth(),widthMeasureSpec);
height=getDefaultSize(getSuggestedMinimumHeight(),heightMeasureSpec);
setMeasuredDimension(width,height);//設定畫布的大小，長和寬
mBitmap=Bitmap.createBitmap(width,height,Bitmap.Config.ARGB_8888);
canvasBit=new Canvas(mBitmap);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
// canvas.drawBitmap(bitmapBackground,0,0,null);
canvas.drawBitmap(bitmapBackground, new Rect(0,0,bitmapBackground.getWidth(),bitmapBackground.getHeight()),new Rect(0,0,width,height),null);
canvasBit.drawRect(0,0,width,height,mPaintCircle);
canvasBit.drawPath(path,mPaintRect);
canvas.drawBitmap(mBitmap,0,0,null);
}
private Path path;
private float x,y,old_x,old_y;
@Override
public boolean onTouchEvent(MotionEvent event) {
switch (event.getAction()){
case MotionEvent.ACTION_MOVE:
x=event.getX();
y=event.getY();
path.moveTo(old_x,old_y);
path.quadTo((x+old_x)/2,(y+old_y)/2,x,y);
invalidate();
old_x=x;
old_y=y;
return true;
case MotionEvent.ACTION_DOWN:
x=event.getX();
y=event.getY();
// path.addCircle(x,y,50,Path.Direction.CW);
path.moveTo(x,y);
invalidate();
old_x=x;
old_y=y;
return true;
}
return super.onTouchEvent(event);
}
}MyBitmapViewACtivity.java
public class MyBitmapViewActivity extends Activity{
private Button btn_SavePicture;
private MyBitmapView myBitmapView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_bitmapview);
btn_SavePicture= (Button) findViewById(R.id.btn_savepicture);
myBitmapView= (MyBitmapView) findViewById(R.id.bitmapiview);
btn_SavePicture.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
myBitmapView.invalidate();
myBitmapView.setDrawingCacheEnabled(true);
Bitmap bitmap=myBitmapView.getDrawingCache(true);
File file=new File(Environment.getExternalStorageDirectory(),System.currentTimeMillis()+".jpg");
if (!file.exists()){
try {
file.createNewFile();
} catch (IOException e) {
e.printStackTrace();
}
}
try {
bitmap.compress(Bitmap.CompressFormat.JPEG,100,new FileOutputStream(file));
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}
});
}
}
下載顯示球
activity_bubble.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@mipmap/imagebac">
<Button
android:id="@+id/btn_start_download"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="開始下載"/>
<com.example.administrator.canvas.widget.MyBubble
android:id="@+id/bubble"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
</LinearLayout>MyBubble.java
public class MyBubble extends View {
private int width;
private int height;
private Paint mPaintAbove;
private Paint mPaintBelow;
private Paint paint;
private Bitmap mBitmap;
private Bitmap mBitmapBac;
private Path path;
private Canvas mCanvas;
private int count=0;
private static final int MESSAGE =0x24;
private Handler handler=new Handler(){
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
switch(msg.what){
case MESSAGE:
count+=10;
if (count>40) {
count = 0;
}
invalidate();// 重新整理
handler.sendEmptyMessageDelayed(MESSAGE,100);
break;
}
}
};
private int currentProgress;
private float maxProgress=100;
//得到進度的最大值
public float getMaxProgress() {
return maxProgress;
}
//設定進度的最大值
public void setMaxProgress(float maxProgress) {
this.maxProgress = maxProgress;
}
//得到當前的進度值
public int getCurrentProgress(){
return currentProgress;
}
//設定當前的進度值
public void setCurrentProgress(int currentProgress){
this.currentProgress=currentProgress;
invalidate();//重新整理
Log.d("當前進度",""+this.currentProgress);
}
public MyBubble(Context context) {
super(context);
}
public MyBubble(Context context, AttributeSet attrs) {
super(context, attrs);
paint=new Paint();
paint.setStyle(Paint.Style.FILL);
paint.setColor(Color.argb(0xff,0x4c,0xaf,0xe9));
mPaintAbove=new Paint();
mPaintAbove.setColor(Color.BLACK);
mPaintAbove.setStyle(Paint.Style.FILL);
mPaintAbove.setTextSize(50);
mPaintAbove.setTextAlign(Paint.Align.CENTER);
mPaintBelow=new Paint();
mPaintBelow.setColor(Color.argb(0xFF,0xae,0xdc,0xff));
mPaintBelow.setStyle(Paint.Style.FILL);
mBitmap= BitmapFactory.decodeResource(getResources(), R.mipmap.imagebac);
PorterDuffXfermode mode=new PorterDuffXfermode(PorterDuff.Mode.SRC_ATOP);
paint.setXfermode(mode);
path=new Path();
handler.sendEmptyMessageDelayed(MESSAGE,100);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
width=getDefaultSize(getSuggestedMinimumWidth(),widthMeasureSpec);
height=getDefaultSize(getSuggestedMinimumHeight(),heightMeasureSpec);
setMeasuredDimension(width,height);//設定畫布的大小，長和寬
mBitmapBac=Bitmap.createBitmap(width,height,Bitmap.Config.ARGB_8888);
mCanvas=new Canvas(mBitmapBac);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
path.reset();
path.moveTo(count+width/8,height/2+width/4-currentProgress/maxProgress*width/2);
for (int i=0;i<15;i++){
path.rQuadTo(10,+5,20,-5);
path.rQuadTo(10,-5,20,+5);
}
path.lineTo(count+width/8+600,height/2+width/4-currentProgress/maxProgress*width/2);
path.lineTo(count+width/8+600,height/2+width/4*3-currentProgress/maxProgress*width/2);
path.lineTo(count+width/8,height/2+width/4*3-currentProgress/maxProgress*width/2);
path.close();
canvas.drawBitmap(mBitmap, 0, 0, null);
canvas.drawCircle(width / 2, height / 2, width / 4, mPaintAbove);
mCanvas.drawCircle(width / 2, height / 2, width / 4, mPaintBelow);
mCanvas.drawPath(path,paint );
canvas.drawBitmap(mBitmapBac, 0, 0, null);
canvas.drawText(currentProgress+"%",width/2,height/2,mPaintAbove);
}
}MyBubbleActivity.java
public class MyBubbleActivity extends Activity{
private Button btn_start;
private static final int PORGRESS=0x25;
private int progrress;
private MyBubble myBubble;
private Handler handler=new Handler(){
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
switch(msg.what){
case PORGRESS:
progrress++;
if (progrress<=100){
myBubble.setCurrentProgress(progrress);
handler.sendEmptyMessageDelayed(PORGRESS,20);
}
break;
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_bubble);
myBubble= (MyBubble) findViewById(R.id.bubble);
btn_start= (Button) findViewById(R.id.btn_start_download);
btn_start.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
handler.sendEmptyMessageDelayed(PORGRESS,10);
}
});
}
}