用戶信息頁面和圓形用戶圖標

Question

Android小工具如何使用戶信息頁面這樣的：

對於用戶圖標下的灰色背景，它是一個小部件？就像簡單地使用圖像視圖一樣，還是有更好的方法來實現這一點？

如果我想要用戶圖標是一個圓形，除了定製一個小部件，還有更方便的方法嗎？

Answer 1

您可以使用Android的循環ImageView。它可以用於各種可繪圖，即來自畢加索的PicassoDrawable或其他非標準繪圖。這裏是圖書館的鏈接： https://github.com/hdodenhof/CircleImageView

Answer 2

You can use this class as your widget and set image inside same as imageview with picasso or image loader 


public class CircularImageView extends ImageView 
    { 
    // Border & Selector configuration variables 
    private boolean hasBorder; 
    private boolean hasSelector; 
    private boolean isSelected; 
    private int borderWidth; 
    private int canvasSize; 
    private int selectorStrokeWidth; 

// Objects used for the actual drawing 
private BitmapShader shader; 
private Bitmap image; 
private Paint paint; 
private Paint paintBorder; 
private Paint paintSelectorBorder; 
private ColorFilter selectorFilter; 

public CircularImageView(Context context) 
{ 
    this(context, null); 
} 

public CircularImageView(Context context, AttributeSet attrs) 
{ 
    this(context, attrs, R.attr.circularImageViewStyle); 
} 

public CircularImageView(Context context, AttributeSet attrs, int defStyle) 
{ 
    super(context, attrs, defStyle); 
    init(context, attrs, defStyle); 
} 

/** 
* Initializes paint objects and sets desired attributes. 
* 
* @param context 
* @param attrs 
* @param defStyle 
*/ 
private void init(Context context, AttributeSet attrs, int defStyle) 
{ 
    // Initialize paint objects 
    paint = new Paint(); 
    paint.setAntiAlias(true); 
    paintBorder = new Paint(); 
    paintBorder.setAntiAlias(true); 
    paintSelectorBorder = new Paint(); 
    paintSelectorBorder.setAntiAlias(true); 

    // load the styled attributes and set their properties 
    TypedArray attributes = context.obtainStyledAttributes(attrs, R.styleable.CircularImageView, defStyle, 0); 

    // Check if border and/or border is enabled 
    hasBorder = attributes.getBoolean(R.styleable.CircularImageView_border, false); 
    hasSelector = attributes.getBoolean(R.styleable.CircularImageView_selector, false); 

    // Set border properties if enabled 
    if(hasBorder) { 
     int defaultBorderSize = (int) (2 * context.getResources().getDisplayMetrics().density + 0.5f); 
     setBorderWidth(attributes.getDimensionPixelOffset(R.styleable.CircularImageView_border_width, defaultBorderSize)); 
     setBorderColor(attributes.getColor(R.styleable.CircularImageView_border_color, Color.WHITE)); 
    } 

    // Set selector properties if enabled 
    if(hasSelector) { 
     int defaultSelectorSize = (int) (2 * context.getResources().getDisplayMetrics().density + 0.5f); 
     setSelectorColor(attributes.getColor(R.styleable.CircularImageView_selector_color, Color.TRANSPARENT)); 
     setSelectorStrokeWidth(attributes.getDimensionPixelOffset(R.styleable.CircularImageView_selector_stroke_width, defaultSelectorSize)); 
     setSelectorStrokeColor(attributes.getColor(R.styleable.CircularImageView_selector_stroke_color, Color.BLUE)); 
    } 

    // Add shadow if enabled 
    if(attributes.getBoolean(R.styleable.CircularImageView_shadow, false)) 
     addShadow(); 

    // We no longer need our attributes TypedArray, give it back to cache 
    attributes.recycle(); 
} 

/** 
* Sets the CircularImageView's border width in pixels. 
* 
* @param borderWidth 
*/ 
public void setBorderWidth(int borderWidth) 
{ 
    this.borderWidth = borderWidth; 
    this.requestLayout(); 
    this.invalidate(); 
} 

/** 
* Sets the CircularImageView's basic border color. 
* 
* @param borderColor 
*/ 
public void setBorderColor(int borderColor) 
{ 
    if (paintBorder != null) 
     paintBorder.setColor(borderColor); 
    this.invalidate(); 
} 

/** 
* Sets the color of the selector to be draw over the 
* CircularImageView. Be sure to provide some opacity. 
* 
* @param selectorColor 
*/ 
public void setSelectorColor(int selectorColor) 
{ 
    this.selectorFilter = new PorterDuffColorFilter(selectorColor, PorterDuff.Mode.SRC_ATOP); 
    this.invalidate(); 
} 

/** 
* Sets the stroke width to be drawn around the CircularImageView 
* during click events when the selector is enabled. 
* 
* @param selectorStrokeWidth 
*/ 
public void setSelectorStrokeWidth(int selectorStrokeWidth) 
{ 
    this.selectorStrokeWidth = selectorStrokeWidth; 
    this.requestLayout(); 
    this.invalidate(); 
} 

/** 
* Sets the stroke color to be drawn around the CircularImageView 
* during click events when the selector is enabled. 
* 
* @param borderColor 
*/ 
public void setSelectorStrokeColor(int selectorStrokeColor) 
{ 
    if (paintSelectorBorder != null) 
     paintSelectorBorder.setColor(selectorStrokeColor); 
    this.invalidate(); 
} 

/** 
* Adds a dark shadow to this CircularImageView. 
*/ 
public void addShadow() 
{ 
    setLayerType(LAYER_TYPE_SOFTWARE, paintBorder); 
    paintBorder.setShadowLayer(4.0f, 0.0f, 2.0f, Color.BLACK); 
} 


@Override 
public void onDraw(Canvas canvas) 
{ 
    // Don't draw anything without an image 
    if(image == null) 
     return; 

    // Nothing to draw (Empty bounds) 
    if(image.getHeight() == 0 || image.getWidth() == 0) 
     return; 

    // Compare canvas sizes 
    int oldCanvasSize = canvasSize; 

    canvasSize = canvas.getWidth(); 
    if(canvas.getHeight() < canvasSize) 
     canvasSize = canvas.getHeight(); 

    // Reinitialize shader, if necessary 
    if(oldCanvasSize != canvasSize) 
     refreshBitmapShader(); 

    // Apply shader to paint 
    paint.setShader(shader); 

    // Keep track of selectorStroke/border width 
    int outerWidth = 0; 

    // Get the exact X/Y axis of the view 
    int center = canvasSize/2; 


    if(hasSelector && isSelected) { // Draw the selector stroke & apply the selector filter, if applicable 
     outerWidth = selectorStrokeWidth; 
     center = (canvasSize - (outerWidth * 2))/2; 

     paint.setColorFilter(selectorFilter); 
     canvas.drawCircle(center + outerWidth, center + outerWidth, ((canvasSize - (outerWidth * 2))/2) + outerWidth - 4.0f, paintSelectorBorder); 
    } 
    else if(hasBorder) { // If no selector was drawn, draw a border and clear the filter instead... if enabled 
     outerWidth = borderWidth; 
     center = (canvasSize - (outerWidth * 2))/2; 

     paint.setColorFilter(null); 
     canvas.drawCircle(center + outerWidth, center + outerWidth, ((canvasSize - (outerWidth * 2))/2) + outerWidth - 4.0f, paintBorder); 
    } 
    else // Clear the color filter if no selector nor border were drawn 
     paint.setColorFilter(null); 

    // Draw the circular image itself 
    canvas.drawCircle(center + outerWidth, center + outerWidth, ((canvasSize - (outerWidth * 2))/2) - 4.0f, paint); 
} 

@Override 
public boolean dispatchTouchEvent(MotionEvent event) 
{ 
    // Check for clickable state and do nothing if disabled 
    if(!this.isClickable()) { 
     this.isSelected = false; 
     return super.onTouchEvent(event); 
    } 

    // Set selected state based on Motion Event 
    switch(event.getAction()) { 
     case MotionEvent.ACTION_DOWN: 
      this.isSelected = true; 
      break; 
     case MotionEvent.ACTION_UP: 
     case MotionEvent.ACTION_SCROLL: 
     case MotionEvent.ACTION_OUTSIDE: 
     case MotionEvent.ACTION_CANCEL: 
      this.isSelected = false; 
      break; 
    } 

    // Redraw image and return super type 
    this.invalidate(); 
    return super.dispatchTouchEvent(event); 
} 

public void invalidate(Rect dirty) { 
    super.invalidate(dirty); 
    image = drawableToBitmap(getDrawable()); 
    if(shader != null || canvasSize > 0) 
     refreshBitmapShader(); 
} 

public void invalidate(int l, int t, int r, int b) { 
    super.invalidate(l, t, r, b); 
    image = drawableToBitmap(getDrawable()); 
    if(shader != null || canvasSize > 0) 
     refreshBitmapShader(); 
} 

@Override 
public void invalidate() { 
    super.invalidate(); 
    image = drawableToBitmap(getDrawable()); 
    if(shader != null || canvasSize > 0) 
     refreshBitmapShader(); 
} 

@Override 
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) 
{ 
    int width = measureWidth(widthMeasureSpec); 
    int height = measureHeight(heightMeasureSpec); 
    setMeasuredDimension(width, height); 
} 

private int measureWidth(int measureSpec) 
{ 
    int result = 0; 
    int specMode = MeasureSpec.getMode(measureSpec); 
    int specSize = MeasureSpec.getSize(measureSpec); 

    if (specMode == MeasureSpec.EXACTLY) { 
     // The parent has determined an exact size for the child. 
     result = specSize; 
    } 
    else if (specMode == MeasureSpec.AT_MOST) { 
     // The child can be as large as it wants up to the specified size. 
     result = specSize; 
    } 
    else { 
     // The parent has not imposed any constraint on the child. 
     result = canvasSize; 
    } 

    return result; 
} 

private int measureHeight(int measureSpecHeight) 
{ 
    int result = 0; 
    int specMode = MeasureSpec.getMode(measureSpecHeight); 
    int specSize = MeasureSpec.getSize(measureSpecHeight); 

    if (specMode == MeasureSpec.EXACTLY) { 
     // We were told how big to be 
     result = specSize; 
    } else if (specMode == MeasureSpec.AT_MOST) { 
     // The child can be as large as it wants up to the specified size. 
     result = specSize; 
    } else { 
     // Measure the text (beware: ascent is a negative number) 
     result = canvasSize; 
    } 

    return (result + 2); 
} 

/** 
* Convert a drawable object into a Bitmap 
* 
* @param drawable 
* @return 
*/ 
public Bitmap drawableToBitmap(Drawable drawable) 
{ 
    if (drawable == null) { // Don't do anything without a proper drawable 
     return null; 
    } 
    else if (drawable instanceof BitmapDrawable) { // Use the getBitmap() method instead if BitmapDrawable 
     return ((BitmapDrawable) drawable).getBitmap(); 
    } 

    // Create Bitmap object out of the drawable 
    Bitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), Bitmap.Config.ARGB_8888); 
    Canvas canvas = new Canvas(bitmap); 
    drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight()); 
    drawable.draw(canvas); 

    return bitmap; 
} 

/** 
* Reinitializes the shader texture used to fill in 
* the Circle upon drawing. 
*/ 
public void refreshBitmapShader() 
{ 
    shader = new BitmapShader(Bitmap.createScaledBitmap(image, canvasSize, canvasSize, false), Shader.TileMode.CLAMP, Shader.TileMode.CLAMP); 
} 

/** 
* Returns whether or not this view is currently 
* in its selected state. 
*/ 
public boolean isSelected() 
{ 
    return this.isSelected; 
} 
} 

for full example refer https://github.com/Pkmmte/CircularImageView/blob/master/circularimageview-eclipse/CircularImageView/src/com/pkmmte/circularimageview/CircularImageView.java