自定义View
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转载请标明出处:http://blog.csdn.net/lmj623565791/article/details/24300125
继续自定义View之旅,前面已经介绍过一个自定义View的基础的例子,Android 自定义View (一),如果你还对自定义View不了解可以去看看。今天给大家带来一个稍微复杂点的例子。
自定义View显示一张图片,下面包含图片的文本介绍,类似相片介绍什么的,不过不重要,主要是学习自定义View的用法么。
还记得上一篇讲的4个步骤么:
1、自定义View的属性
2、在View的构造方法中获得我们自定义的属性
[ 3、重写onMesure ]
4、重写onDraw
直接切入正题:
1、在res/values/attr.xml
- <?xmlversion="1.0"encoding="utf-8"?>
- <resources>
- <attrname="titleText"format="string"/>
- <attrname="titleTextSize"format="dimension"/>
- <attrname="titleTextColor"format="color"/>
- <attrname="image"format="reference"/>
- <attrname="imageScaleType">
- <enumname="fillXY"value="0"/>
- <enumname="center"value="1"/>
- </attr>
- <declare-styleablename="CustomImageView">
- <attrname="titleText"/>
- <attrname="titleTextSize"/>
- <attrname="titleTextColor"/>
- <attrname="image"/>
- <attrname="imageScaleType"/>
- </declare-styleable>
- </resources>
<?xml version="1.0" encoding="utf-8"?><resources> <attr name="titleText" format="string" /> <attr name="titleTextSize" format="dimension" /> <attr name="titleTextColor" format="color" /> <attr name="image" format="reference" /> <attr name="imageScaleType"> <enum name="fillXY" value="0" /> <enum name="center" value="1" /> </attr> <declare-styleable name="CustomImageView"> <attr name="titleText" /> <attr name="titleTextSize" /> <attr name="titleTextColor" /> <attr name="image" /> <attr name="imageScaleType" /> </declare-styleable></resources>
2、在构造中获得我们的自定义属性:
- /**
- * 初始化所特有自定义类型
- *
- * @param context
- * @param attrs
- * @param defStyle
- */
- public CustomImageView(Context context, AttributeSet attrs,int defStyle)
- {
- super(context, attrs, defStyle);
- TypedArray a = context.getTheme().obtainStyledAttributes(attrs, R.styleable.CustomImageView, defStyle,0);
- int n = a.getIndexCount();
- for (int i =0; i < n; i++)
- {
- int attr = a.getIndex(i);
- switch (attr)
- {
- case R.styleable.CustomImageView_image:
- mImage = BitmapFactory.decodeResource(getResources(), a.getResourceId(attr,0));
- break;
- case R.styleable.CustomImageView_imageScaleType:
- mImageScale = a.getInt(attr, 0);
- break;
- case R.styleable.CustomImageView_titleText:
- mTitle = a.getString(attr);
- break;
- case R.styleable.CustomImageView_titleTextColor:
- mTextColor = a.getColor(attr, Color.BLACK);
- break;
- case R.styleable.CustomImageView_titleTextSize:
- mTextSize = a.getDimensionPixelSize(attr, (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP,
- 16, getResources().getDisplayMetrics()));
- break;
- }
- }
- a.recycle();
- rect = new Rect();
- mPaint = new Paint();
- mTextBound = new Rect();
- mPaint.setTextSize(mTextSize);
- // 计算了描绘字体需要的范围
- mPaint.getTextBounds(mTitle, 0, mTitle.length(), mTextBound);
- }
/** * 初始化所特有自定义类型 * * @param context * @param attrs * @param defStyle */public CustomImageView(Context context, AttributeSet attrs, int defStyle){super(context, attrs, defStyle);TypedArray a = context.getTheme().obtainStyledAttributes(attrs, R.styleable.CustomImageView, defStyle, 0);int n = a.getIndexCount();for (int i = 0; i < n; i++){int attr = a.getIndex(i);switch (attr){case R.styleable.CustomImageView_image:mImage = BitmapFactory.decodeResource(getResources(), a.getResourceId(attr, 0));break;case R.styleable.CustomImageView_imageScaleType:mImageScale = a.getInt(attr, 0);break;case R.styleable.CustomImageView_titleText:mTitle = a.getString(attr);break;case R.styleable.CustomImageView_titleTextColor:mTextColor = a.getColor(attr, Color.BLACK);break;case R.styleable.CustomImageView_titleTextSize:mTextSize = a.getDimensionPixelSize(attr, (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP,16, getResources().getDisplayMetrics()));break;}}a.recycle();rect = new Rect();mPaint = new Paint();mTextBound = new Rect();mPaint.setTextSize(mTextSize);// 计算了描绘字体需要的范围mPaint.getTextBounds(mTitle, 0, mTitle.length(), mTextBound);}
3、重写onMeasure
- @Override
- protected void onMeasure(int widthMeasureSpec,int heightMeasureSpec)
- {
- // super.onMeasure(widthMeasureSpec, heightMeasureSpec);
- /**
- * 设置宽度
- */
- int specMode = MeasureSpec.getMode(widthMeasureSpec);
- int specSize = MeasureSpec.getSize(widthMeasureSpec);
- if (specMode == MeasureSpec.EXACTLY)// match_parent , accurate
- {
- Log.e("xxx", "EXACTLY");
- mWidth = specSize;
- } else
- {
- // 由图片决定的宽
- int desireByImg = getPaddingLeft() + getPaddingRight() + mImage.getWidth();
- // 由字体决定的宽
- int desireByTitle = getPaddingLeft() + getPaddingRight() + mTextBound.width();
- if (specMode == MeasureSpec.AT_MOST)// wrap_content
- {
- int desire = Math.max(desireByImg, desireByTitle);
- mWidth = Math.min(desire, specSize);
- Log.e("xxx", "AT_MOST");
- }
- }
- /***
- * 设置高度
- */
- specMode = MeasureSpec.getMode(heightMeasureSpec);
- specSize = MeasureSpec.getSize(heightMeasureSpec);
- if (specMode == MeasureSpec.EXACTLY)// match_parent , accurate
- {
- mHeight = specSize;
- } else
- {
- int desire = getPaddingTop() + getPaddingBottom() + mImage.getHeight() + mTextBound.height();
- if (specMode == MeasureSpec.AT_MOST)// wrap_content
- {
- mHeight = Math.min(desire, specSize);
- }
- }
- setMeasuredDimension(mWidth, mHeight);
- }
@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec){// super.onMeasure(widthMeasureSpec, heightMeasureSpec);/** * 设置宽度 */int specMode = MeasureSpec.getMode(widthMeasureSpec);int specSize = MeasureSpec.getSize(widthMeasureSpec);if (specMode == MeasureSpec.EXACTLY)// match_parent , accurate{Log.e("xxx", "EXACTLY");mWidth = specSize;} else{// 由图片决定的宽int desireByImg = getPaddingLeft() + getPaddingRight() + mImage.getWidth();// 由字体决定的宽int desireByTitle = getPaddingLeft() + getPaddingRight() + mTextBound.width();if (specMode == MeasureSpec.AT_MOST)// wrap_content{int desire = Math.max(desireByImg, desireByTitle);mWidth = Math.min(desire, specSize);Log.e("xxx", "AT_MOST");}}/*** * 设置高度 */specMode = MeasureSpec.getMode(heightMeasureSpec);specSize = MeasureSpec.getSize(heightMeasureSpec);if (specMode == MeasureSpec.EXACTLY)// match_parent , accurate{mHeight = specSize;} else{int desire = getPaddingTop() + getPaddingBottom() + mImage.getHeight() + mTextBound.height();if (specMode == MeasureSpec.AT_MOST)// wrap_content{mHeight = Math.min(desire, specSize);}}setMeasuredDimension(mWidth, mHeight);}
4、重写onDraw
- @Override
- protected void onDraw(Canvas canvas)
- {
- // super.onDraw(canvas);
- /**
- * 边框
- */
- mPaint.setStrokeWidth(4);
- mPaint.setStyle(Paint.Style.STROKE);
- mPaint.setColor(Color.CYAN);
- canvas.drawRect(0,0, getMeasuredWidth(), getMeasuredHeight(), mPaint);
- rect.left = getPaddingLeft();
- rect.right = mWidth - getPaddingRight();
- rect.top = getPaddingTop();
- rect.bottom = mHeight - getPaddingBottom();
- mPaint.setColor(mTextColor);
- mPaint.setStyle(Style.FILL);
- /**
- * 当前设置的宽度小于字体需要的宽度,将字体改为xxx...
- */
- if (mTextBound.width() > mWidth)
- {
- TextPaint paint = new TextPaint(mPaint);
- String msg = TextUtils.ellipsize(mTitle, paint, (float) mWidth - getPaddingLeft() - getPaddingRight(),
- TextUtils.TruncateAt.END).toString();
- canvas.drawText(msg, getPaddingLeft(), mHeight - getPaddingBottom(), mPaint);
- } else
- {
- //正常情况,将字体居中
- canvas.drawText(mTitle, mWidth / 2 - mTextBound.width() *1.0f / 2, mHeight - getPaddingBottom(), mPaint);
- }
- //取消使用掉的快
- rect.bottom -= mTextBound.height();
- if (mImageScale == IMAGE_SCALE_FITXY)
- {
- canvas.drawBitmap(mImage, null, rect, mPaint);
- } else
- {
- //计算居中的矩形范围
- rect.left = mWidth / 2 - mImage.getWidth() /2;
- rect.right = mWidth / 2 + mImage.getWidth() /2;
- rect.top = (mHeight - mTextBound.height()) / 2 - mImage.getHeight() /2;
- rect.bottom = (mHeight - mTextBound.height()) / 2 + mImage.getHeight() /2;
- canvas.drawBitmap(mImage, null, rect, mPaint);
- }
- }
@Overrideprotected void onDraw(Canvas canvas){// super.onDraw(canvas);/** * 边框 */mPaint.setStrokeWidth(4);mPaint.setStyle(Paint.Style.STROKE);mPaint.setColor(Color.CYAN);canvas.drawRect(0, 0, getMeasuredWidth(), getMeasuredHeight(), mPaint);rect.left = getPaddingLeft();rect.right = mWidth - getPaddingRight();rect.top = getPaddingTop();rect.bottom = mHeight - getPaddingBottom();mPaint.setColor(mTextColor);mPaint.setStyle(Style.FILL);/** * 当前设置的宽度小于字体需要的宽度,将字体改为xxx... */if (mTextBound.width() > mWidth){TextPaint paint = new TextPaint(mPaint);String msg = TextUtils.ellipsize(mTitle, paint, (float) mWidth - getPaddingLeft() - getPaddingRight(),TextUtils.TruncateAt.END).toString();canvas.drawText(msg, getPaddingLeft(), mHeight - getPaddingBottom(), mPaint);} else{//正常情况,将字体居中canvas.drawText(mTitle, mWidth / 2 - mTextBound.width() * 1.0f / 2, mHeight - getPaddingBottom(), mPaint);}//取消使用掉的快rect.bottom -= mTextBound.height();if (mImageScale == IMAGE_SCALE_FITXY){canvas.drawBitmap(mImage, null, rect, mPaint);} else{//计算居中的矩形范围rect.left = mWidth / 2 - mImage.getWidth() / 2;rect.right = mWidth / 2 + mImage.getWidth() / 2;rect.top = (mHeight - mTextBound.height()) / 2 - mImage.getHeight() / 2;rect.bottom = (mHeight - mTextBound.height()) / 2 + mImage.getHeight() / 2;canvas.drawBitmap(mImage, null, rect, mPaint);}}
代码,结合注释和第一篇View的使用,应该可以看懂,不明白的留言。下面我们引入我们的自定义View:
- <LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
- xmlns:tools="http://schemas.android.com/tools"
- xmlns:zhy="http://schemas.android.com/apk/res/com.zhy.customview02"
- android:layout_width="match_parent"
- android:layout_height="match_parent"
- android:orientation="vertical">
- <com.zhy.customview02.view.CustomImageView
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:layout_margin="10dp"
- android:padding="10dp"
- zhy:image="@drawable/ic_launcher"
- zhy:imageScaleType="center"
- zhy:titleText="hello andorid ! "
- zhy:titleTextColor="#ff0000"
- zhy:titleTextSize="30sp"/>
- <com.zhy.customview02.view.CustomImageView
- android:layout_width="100dp"
- android:layout_height="wrap_content"
- android:layout_margin="10dp"
- android:padding="10dp"
- zhy:image="@drawable/ic_launcher"
- zhy:imageScaleType="center"
- zhy:titleText="helloworldwelcome"
- zhy:titleTextColor="#00ff00"
- zhy:titleTextSize="20sp"/>
- <com.zhy.customview02.view.CustomImageView
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:layout_margin="10dp"
- android:padding="10dp"
- zhy:image="@drawable/lmj"
- zhy:imageScaleType="center"
- zhy:titleText="妹子~"
- zhy:titleTextColor="#ff0000"
- zhy:titleTextSize="12sp"/>
- </LinearLayout>
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