Android 自定义View (二) 进阶
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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
- <?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>
<?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);
- }
@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); }
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);
- }
- }
@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); } }
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:
- <LinearLayout xmlns: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>
<LinearLayout xmlns: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>
我特意让显示出现3中情况:
1、字体的宽度大于图片,且View宽度设置为wrap_content
2、View宽度设置为精确值,字体的长度大于此宽度
3、图片的宽度大于字体,且View宽度设置为wrap_content
看看显示效果:
怎么样,对于这三种情况所展示的效果都还不错吧。
好了,就到这里,各位看官,没事留个言,顶一个呗~
源码点击下载
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- Android 自定义View (二) 进阶
- Android 自定义View (二) 进阶
- Android 自定义View (二) 进阶
- Android 自定义View (二) 进阶
- Android 自定义View (二) 进阶
- Android 自定义View (二) 进阶
- Android 自定义View (二) 进阶
- Android 自定义View (二) 进阶
- Android 自定义View (二) 进阶
- Android 自定义View (二) 进阶
- Android 自定义View (二) 进阶
- Android 自定义View (二) 进阶
- Android 自定义View (二) 进阶
- Android 自定义View (二) 进阶
- Android 自定义View (二) 进阶
- Android 自定义View (二) 进阶
- Android 自定义View (二) 进阶
- Android 自定义View (二) 进阶
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