- package com.min.androidtest;
- import android.app.Activity;
- import android.content.Context;
- import android.graphics.Canvas;
- import android.graphics.Color;
- import android.graphics.Paint;
- import android.graphics.Rect;
- import android.os.Bundle;
- import android.util.Log;
- import android.view.View;
- import android.view.ViewGroup.LayoutParams;
- import android.widget.Button;
- import android.widget.LinearLayout;
- public class AndroidTest extends Activity {
- private static final String TAG = “AndroidTest”;
- private static LinearLayout ll;
- private Button mBtn;
- private MyView mMyView;
- private boolean mbClickFlg = false;
- @Override
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- // setContentView(R.layout.main);
- // 设置画面布局
- ll = new LinearLayout(this.getBaseContext());
- ll.setOrientation(LinearLayout.VERTICAL);
- // button
- mBtn = new Button(this.getBaseContext());
- mBtn.setText(“Draw”);
- //
- mBtn.setTextColor(0xff000000);
- mBtn.setTextSize(16);
- LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(
- LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
- lp.topMargin = 5;
- lp.leftMargin = 5;
- ll.addView(mBtn, lp);
- // 设置画图view
- LinearLayout.LayoutParams lp1 = new LinearLayout.LayoutParams(
- LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT);
- lp1.weight = 1;
- Rect rect = new Rect(10, 40, 90, 66);
- mMyView = new MyView(this.getBaseContext(), rect);
- mMyView.setOnClickListener(new View.OnClickListener() {
- public void onClick(View v) {
- // TODO Auto-generated method stub
- Log.d(TAG, “mMyView clicked.”);
- if (mbClickFlg) {
- mMyView.setStrText(“Click Me”);
- } else {
- mMyView.setStrText(“Again…”);
- }
- mbClickFlg = !mbClickFlg;
- mMyView.postInvalidate();
- }
- });
- ll.addView(mMyView, lp1);
- setContentView(ll);
- // 设置监听按钮点击事件
- mBtn.setOnClickListener(new View.OnClickListener() {
- public void onClick(View v) {
- // TODO Auto-generated method stub
- mMyView.drawLine();
- mMyView.postInvalidate();
- }
- });
- }
- // 自定义画图类,继承自View类
- public class MyView extends View {
- private Paint paint;
- private boolean bDrawLineFlg = false;
- private Rect mRect;
- private String mStrText = “having”;
- MyView(Context context) {
- super(context);
- // 生成paint
- paint = new Paint();
- }
- MyView(Context context, Rect rect) {
- super(context);
- // 生成paint
- paint = new Paint();
- mRect = rect;
- }
- @Override
- protected void onDraw(Canvas canvas) {
- // TODO Auto-generated method stub
- super.onDraw(canvas);
- // 填充整个画布
- canvas.drawColor(Color.GRAY);
- // canvas.drawRGB(255, 255, 255); // 也可以
- // 画图
- if (bDrawLineFlg) {
- Log.d(TAG, “drawing”);
- // Draw top 6 lines
- paint.setColor(0xFFFFC0CB);
- canvas.drawLine(mRect.left + 2, mRect.top, mRect.right – 2, mRect.top, paint);
- canvas.drawLine(mRect.left + 1, mRect.top + 1, mRect.right –1, mRect.top + 1, paint);
- for (int i = 2; i < 6; i++) {
- canvas.drawLine(mRect.left, mRect.top + i, mRect.right, mRect.top + i, paint);
- }
- // Draw middle 14 lines
- paint.setColor(0xFFFFB6C1);
- for (int i = 6; i < 20; i++) {
- canvas.drawLine(mRect.left, mRect.top + i, mRect.right, mRect.top + i, paint);
- }
- // Draw bottom 6 lines
- paint.setColor(0xFFFFC0CB);
- for (int i = 20; i < 24; i++) {
- canvas.drawLine(mRect.left, mRect.top + i, mRect.right, mRect.top + i, paint);
- }
- canvas.drawLine(mRect.left + 1, mRect.top + 24, mRect.right – 1, mRect.top + 24, paint);
- canvas.drawLine(mRect.left + 2, mRect.top + 25, mRect.right – 2, mRect.top + 25, paint);
- // draw text
- paint.setColor(0xFF0000FF);
- paint.setTextSize(16);
- paint.setAntiAlias(true); // 消除锯齿
- paint.setFlags(Paint.ANTI_ALIAS_FLAG); // 消除锯齿
- try{
- float widths[] = new float[mStrText.length()];
- paint.getTextWidths(mStrText, widths);
- float textWidth = 0.0f;
- for(int i = 0; i < widths.length; i++) {
- textWidth += widths[i];
- Log.d(TAG, “widths[0] = “ + widths[i]);
- }
- Log.d(TAG, “textWidth = “ + textWidth);
- float textSize = paint.getTextSize();
- Log.d(TAG, “textSize = “ + textSize);
- canvas.drawText(mStrText,
- mRect.left + (mRect.width() – textWidth) / 2,
- mRect.bottom – (mRect.height() – textSize) / 2 – 3, // add offset to y position
- paint);
- } catch(Exception e) {
- e.printStackTrace();
- }
- }
- }
- public void drawLine() {
- // 设置画线标志
- bDrawLineFlg = !bDrawLineFlg;
- if (bDrawLineFlg) {
- mBtn.setText(“Hide”);
- } else {
- mBtn.setText(“Draw”);
- }
- Log.d(TAG, “to be draw”);
- }
- public void setStrText(String text) {
- mStrText = text;
- }
- }
- }
原创文章,作者:奋斗,如若转载,请注明出处:https://blog.ytso.com/5636.html