Android高手进阶教程(三)之----Android 中自定义View的应用.
16lz
2021-01-23
大家好我们今天的教程是在Android 教程中自定义View 的学习,对于初学着来说,他们习惯了Android 传统的页面布局方式,如下代码: view plaincopy to clipboardprint?
其中A extends LinerLayout, B extends TextView.
其中A extends LinerLayout, B extends TextView. 为了帮助大家更容易理解,我写了一个简单的Demo ,具体步骤如下: 首先新建一个Android 工程 命名为ViewDemo . 然后自定义一个View 类,命名为MyView(extends View) .代码如下:
- <?xmlversion="1.0"encoding="utf-8"?>
- <LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
- android:orientation="vertical"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent"
- >
- <TextView
- android:layout_width="fill_parent"
- android:layout_height="wrap_content"
- android:text="@string/hello"
- />
- </LinearLayout>
- <?xmlversion="1.0"encoding="utf-8"?>
- <LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
- android:orientation="vertical"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent"
- >
- <TextView
- android:layout_width="fill_parent"
- android:layout_height="wrap_content"
- android:text="@string/hello"
- />
- </LinearLayout>
- <?xmlversion="1.0"encoding="utf-8"?>
- <A>
- <B></B>
- </A>
- <?xmlversion="1.0"encoding="utf-8"?>
- <A>
- <B></B>
- </A>
其中A extends LinerLayout, B extends TextView.
其中A extends LinerLayout, B extends TextView. 为了帮助大家更容易理解,我写了一个简单的Demo ,具体步骤如下: 首先新建一个Android 工程 命名为ViewDemo . 然后自定义一个View 类,命名为MyView(extends View) .代码如下:
- viewplaincopytoclipboardprint?
- packagecom.android.tutor;
- importandroid.content.Context;
- importandroid.graphics.Canvas;
- importandroid.graphics.Color;
- importandroid.graphics.Paint;
- importandroid.graphics.Rect;
- importandroid.graphics.Paint.Style;
- importandroid.util.AttributeSet;
- importandroid.view.View;
- publicclassMyViewextendsView{
- privatePaintmPaint;
- privateContextmContext;
- privatestaticfinalStringmString="WelcometoMrWei'sblog";
- publicMyView(Contextcontext){
- super(context);
- }
- publicMyView(Contextcontext,AttributeSetattr)
- {
- super(context,attr);
- }
- @Override
- protectedvoidonDraw(Canvascanvas){
- //TODOAuto-generatedmethodstub
- super.onDraw(canvas);
- mPaint=newPaint();
- //设置画笔颜色
- mPaint.setColor(Color.RED);
- //设置填充
- mPaint.setStyle(Style.FILL);
- //画一个矩形,前俩个是矩形左上角坐标,后面俩个是右下角坐标
- canvas.drawRect(newRect(10,10,100,100),mPaint);
- mPaint.setColor(Color.BLUE);
- //绘制文字
- canvas.drawText(mString,10,110,mPaint);
- }
- }
- packagecom.android.tutor;
- importandroid.content.Context;
- importandroid.graphics.Canvas;
- importandroid.graphics.Color;
- importandroid.graphics.Paint;
- importandroid.graphics.Rect;
- importandroid.graphics.Paint.Style;
- importandroid.util.AttributeSet;
- importandroid.view.View;
- publicclassMyViewextendsView{
- privatePaintmPaint;
- privateContextmContext;
- privatestaticfinalStringmString="WelcometoMrWei'sblog";
- publicMyView(Contextcontext){
- super(context);
- }
- publicMyView(Contextcontext,AttributeSetattr)
- {
- super(context,attr);
- }
- @Override
- protectedvoidonDraw(Canvascanvas){
- //TODOAuto-generatedmethodstub
- super.onDraw(canvas);
- mPaint=newPaint();
- //设置画笔颜色
- mPaint.setColor(Color.RED);
- //设置填充
- mPaint.setStyle(Style.FILL);
- //画一个矩形,前俩个是矩形左上角坐标,后面俩个是右下角坐标
- canvas.drawRect(newRect(10,10,100,100),mPaint);
- mPaint.setColor(Color.BLUE);
- //绘制文字
- canvas.drawText(mString,10,110,mPaint);
- }
- }
- 然后将我们自定义的View加入到main.xml布局文件中,代码如下:
- viewplaincopytoclipboardprint?
- <?xmlversion="1.0"encoding="utf-8"?>
- <LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
- android:orientation="vertical"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent"
- >
- <TextView
- android:layout_width="fill_parent"
- android:layout_height="wrap_content"
- android:text="@string/hello"
- />
- <com.android.tutor.MyView
- android:layout_width="fill_parent"
- android:layout_height="fill_parent"
- />
- </LinearLayout>
- <?xmlversion="1.0"encoding="utf-8"?>
- <LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
- android:orientation="vertical"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent"
- >
- <TextView
- android:layout_width="fill_parent"
- android:layout_height="wrap_content"
- android:text="@string/hello"
- />
- <com.android.tutor.MyView
- android:layout_width="fill_parent"
- android:layout_height="fill_parent"
- />
- </LinearLayout>
本文出自 “Android_Tutor” 博客,请务必保留此出处http://weizhulin.blog.51cto.com/1556324/311457
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