查网站备案号,温州门户网站,衡水网站建设衡水,ui最好的网站在自己自定义的一个组件中由于需要用图片显示数字编号#xff0c;而当前图片就只有一张#xff0c;上面有0-9是个数字#xff0c;于是不得不考虑将其中一个个的数字切割下来#xff0c;需要显示什么数字#xff0c;只需要组合一下就好了。 下面是程序的关键代码#xff…在自己自定义的一个组件中由于需要用图片显示数字编号而当前图片就只有一张上面有0-9是个数字于是不得不考虑将其中一个个的数字切割下来需要显示什么数字只需要组合一下就好了。 下面是程序的关键代码 在MyView继承于View类中的重写的onDraw(Canvas canvas)方法中有如下代码段
Bitmap resource BitmapFactory.decodeResource(this.getResources(), R.drawable.num); Bitmap zero Bitmap.createBitmap(resource, 0, 0, 12, 12); Bitmap one Bitmap.createBitmap(resource, 12, 0, 12, 12); Bitmap two Bitmap.createBitmap(resource, 24, 0, 12, 12); Bitmap three Bitmap.createBitmap(resource, 36, 0, 12, 12); Bitmap four Bitmap.createBitmap(resource, 48, 0, 12, 12); Bitmap five Bitmap.createBitmap(resource, 60, 0, 12, 12); Bitmap six Bitmap.createBitmap(resource, 72, 0, 12, 12); Bitmap seven Bitmap.createBitmap(resource, 84, 0, 12, 12); Bitmap eight Bitmap.createBitmap(resource, 96, 0, 12, 12); Bitmap nine Bitmap.createBitmap(resource, 108, 0, 12, 12);
其中R.drawable.num为数字图片每个数字占据的像素为12*12Bitmap.createBitmap方法中的五个参数意义分别为需要切割的图片资源、切割起始点的X坐标、切割起始点的Y坐标、切割多宽、切割多高。 切割下来之后就非常简单的就可以显示各种数字了例如用String类型的number表示需要显示的数字则
char nums[] number.toCharArray(); for(int i 0; i nums.length; i ) { if(nums[i] 0) { canvas.drawBitmap(zero, i * 12, 0, mPaint); } else if(nums[i] 1) { canvas.drawBitmap(one, i * 12, 0, mPaint); } else if(nums[i] 2) { canvas.drawBitmap(two, i * 12, 0, mPaint); } else if(nums[i] 3) { canvas.drawBitmap(three, i * 12, 0, mPaint); } else if(nums[i] 4) { canvas.drawBitmap(four, i * 12, 0, mPaint); } else if(nums[i] 5) { canvas.drawBitmap(five, i * 12, 0, mPaint); } else if(nums[i] 6) { canvas.drawBitmap(six, i * 12, 0, mPaint); } else if(nums[i] 7) { canvas.drawBitmap(seven, i * 12, 0, mPaint); } else if(nums[i] 8) { canvas.drawBitmap(eight, i * 12, 0, mPaint); } else if(nums[i] 9) { canvas.drawBitmap(nine, i * 12, 0, mPaint); } }
其中canvas为画布drawBitmap方法中的四个参数的意义分别为需要绘制的图片资源、在画布上绘制的起始点的X坐标、Y坐标、画笔。其中画笔在此处可以不进行任何设置只需new一个出来即可Paint mPaint new Paint();
完整代码
NumView
package com.barney;import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
import android.util.DisplayMetrics;
import android.view.View;public class NumView extends View {private static Paint mPaint;private String num;public NumView(Context context, String num) {super(context);this.num num;mPaint new Paint();}Overridepublic void draw(Canvas canvas) {super.onDraw(canvas);int base 0;mPaint.setAntiAlias(true);DisplayMetrics dm new DisplayMetrics(); dm getResources().getDisplayMetrics(); BitmapFactory.Options options new BitmapFactory.Options();options.inDensity dm.densityDpi;Bitmap resource BitmapFactory.decodeResource(this.getResources(), R.drawable.num, options);Bitmap zero Bitmap.createBitmap(resource, 0, 0, 12, 12);Bitmap one Bitmap.createBitmap(resource, 12, 0, 12, 12);Bitmap two Bitmap.createBitmap(resource, 24, 0, 12, 12);Bitmap three Bitmap.createBitmap(resource, 36, 0, 12, 12);Bitmap four Bitmap.createBitmap(resource, 48, 0, 12, 12);Bitmap five Bitmap.createBitmap(resource, 60, 0, 12, 12);Bitmap six Bitmap.createBitmap(resource, 72, 0, 12, 12);Bitmap seven Bitmap.createBitmap(resource, 84, 0, 12, 12);Bitmap eight Bitmap.createBitmap(resource, 96, 0, 12, 12);Bitmap nine Bitmap.createBitmap(resource, 108, 0, 12, 12);char nums[] num.toCharArray();for(int i 0; i nums.length; i ) {Rect rect new Rect();rect.set(base i * 12, 0, base i * 12 12, 12);Bitmap bitmap null;if(nums[i] 0) {bitmap zero;} else if(nums[i] 1) {bitmap one;} else if(nums[i] 2) {bitmap two;} else if(nums[i] 3) {bitmap three;} else if(nums[i] 4) {bitmap four;} else if(nums[i] 5) {bitmap five;} else if(nums[i] 6) {bitmap six;} else if(nums[i] 7) {bitmap seven;} else if(nums[i] 8) {bitmap eight;} else if(nums[i] 9) {bitmap nine;}canvas.drawBitmap(bitmap,null, rect, mPaint);}}
}
BitmapDemoActivity
package com.barney;import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;public class BitmapDemoActivity extends Activity {private EditText myEditText;private Button myButton;private LinearLayout myLinearLayout;/** Called when the activity is first created. */Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);myButton (Button) this.findViewById(R.id.myButton);myEditText (EditText) this.findViewById(R.id.myEditText);myLinearLayout (LinearLayout) this.findViewById(R.id.myLinearLayout);myButton.setOnClickListener(new OnClickListener() {Overridepublic void onClick(View v) {// TODO Auto-generated method stubString num myEditText.getText().toString();NumView numView new NumView(BitmapDemoActivity.this, num);myLinearLayout.removeAllViews();myLinearLayout.addView(numView);}});}
}
源代码
源代码
参考链接
Android下利用Bitmap切割图片 - - ITeye技术网站
效果如下
