android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/hello"" />

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android

Android 中自定义View的应用

2016/03/22 16:26 [db:作者] 返回上一页

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android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello"
/>


android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello"
/>

当然上面的布局方式可以帮助我们完成简单应用的开发了,但是如果你想写一个复杂的应用,这样就有点牵强了,大家不信可以下源码都研究看看,高手写的布局方式,如上面的布局高手通常是这样写的:
view plaincopy to clipboardprint?








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:
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package com.android.tutor;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.Paint.Style;
import android.util.AttributeSet;
import android.view.View;
public class MyView extends View {
private Paint mPaint;
private Context mContext;
private static final String mString = “Welcome to Mr Wei’s blog”;

public MyView(Context context) {
super(context);

}
public MyView(Context context,AttributeSet attr)
{
super(context,attr);

}
@Override
protected void onDraw(Canvas canvas) {
// TODO Auto-generated method stub
super.onDraw(canvas);

mPaint = new Paint();

//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(new Rect(10, 10, 100, 100), mPaint);

mPaint.setColor(Color.BLUE);
//绘制文字
canvas.drawText(mString, 10, 110, mPaint);
}
}
package com.android.tutor;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.Paint.Style;
import android.util.AttributeSet;
import android.view.View;
public class MyView extends View {
private Paint mPaint;
private Context mContext;
private static final String mString = “Welcome to Mr Wei’s blog”;

public MyView(Context context) {
super(context);

}
public MyView(Context context,AttributeSet attr)
{
super(context,attr);

}
@Override
protected void onDraw(Canvas canvas) {
// TODO Auto-generated method stub
super.onDraw(canvas);

mPaint = new Paint();

//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(new Rect(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:
view plaincopy to clipboardprint?

android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello"
/>
android:layout_width="fill_parent"
android:layout_height="fill_parent"
/>


android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello"
/>
android:layout_width="fill_parent"
android:layout_height="fill_parent"
/>


文章来源:http://www.bozhiyue.com/mianshiti/android/2016/0322/5947.html
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