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[转载]Android 自定义view（可重用）-Android开发进阶&经验分享-eoe Android开发者社区_Android开发论坛 – Powered by Discuz!.
Android提供了强大的可复用组件，但特殊情况需要自己的自定义的View组件，下面自定义一个View。
首先在values/attrs.xml中定义好自定义的View会有哪些属性需要在XML中配置：
< ?xml version="1.0" encoding="utf-8"?> < resources> < declare-styleable name="MyView"> < attr name="textColor" format="color" /> < attr name="textSize" format="dimension" /> //在attrs中定义background < attr name="imgBackground" format="integer" /> < attr name="textPaddingLeft" format="dimension"/> < attr name="textPaddingTop" format="dimension"/> < /declare-styleable> < /resources>
如果需要在配置文件中使用该自定义组件，注意一定要重写public View(Context context, AttributeSet attrs)的构造方法，而不是public View(Context context)。如果只需要在程序中利用代码使用该组件可以只覆写public View(Context context)
编写自定义的View-MyView.Java，继承View。
package eoe.cuntomizedview;
import java.util.Calendar;
import test.cuntomizedview.R;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.os.SystemClock;
import android.util.AttributeSet;
import android.view.View;
public class MyView extends View {
private Paint mPaint;
private Context mContext;
private String mStr;
public MyView(Context context, AttributeSet attrs) {
super(context, attrs);
mContext = context;
nitMyView();
/*获取在xml中配置的属性值*/
TypedArray params = context.obtainStyledAttributes(attrs,R.styleable.MyView);
//取得
backgroundint backgroudId = params.getResourceId(
R.styleable.MyView_imgBackground, 0);
if (backgroudId != 0)
setBackgroundResource(backgroudId);
int textColor = params.getColor(R.styleable.MyView_textColor,0XFFFFFFFF);
setTextColor(textColor);
float textSize = params.getDimension(R.styleable.MyView_textSize, 36);
setTextSize(textSize);
float paddingLeft = params.getDimension(R.styleable.MyView_textPaddingLeft, 41);
float paddingTop = params.getDimension(R.styleable.MyView_textPaddingTop, 21);
setPaddings(paddingLeft, paddingTop);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
if(mStr != null) {
canvas.drawText(mStr, 0, 0, mPaint);
}
canvas.drawText(“heiheihei”, 30, 60, mPaint);
}
private void initMyView() {
mPaint = new Paint();
mPaint.setColor(Color.WHITE);
}
private void setTextColor(int textColor) {
mPaint.setColor(0XFFAABBCC);
}
private void setTextSize(float textSize) {
mPaint.setTextSize(textSize);
}
private void setPaddings(float paddingLeft, float paddingTop) {
setPadding((int)paddingLeft, (int)paddingTop, 0, 0);
}
}
注意怎样在attrs中怎样定义background并取得background。
在layout中使用MyView
< ?xml version="1.0" encoding="utf-8"?> < LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res/test.cuntomizedview" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> < test.cuntomizedview.MyView android:id="@+id/v" android:layout_width="fill_parent" android:layout_height="fill_parent" app:textColor="#FFFFFFFF" app:textSize="40dip" app:textPaddingLeft="40dip" app:textPaddingTop="40dip" app:imgBackground="@drawable/bg_time" /> < /LinearLayout>
