Android移动开发之【Android实战项目】渐变的TextView小漂亮代码

直接继承自Android中原有控件

渐变的TextView

效果&＃xff1a;

代码&＃xff1a;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.LinearGradient;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.Shader;
import android.support.v7.widget.AppCompatTextView;
import android.util.AttributeSet;
import android.util.Log;public class CustomTextView extends AppCompatTextView {private final static String TAG &＃61; CustomTextView.class.getSimpleName();private Paint paint1;private Paint paint2;private int mWidth;private LinearGradient gradient;private Matrix matrix;//渐变的速度private int deltaX;public CustomTextView(Context context) {super(context, null);}public CustomTextView(Context context, AttributeSet attrs) {super(context, attrs);initView(context, attrs);}private void initView(Context context, AttributeSet attrs) {paint1 &＃61; new Paint();paint1.setColor(getResources().getColor(android.R.color.holo_blue_dark));paint1.setStyle(Paint.Style.FILL);}&＃64;Overrideprotected void onSizeChanged(int w, int h, int oldw, int oldh) {super.onSizeChanged(w, h, oldw, oldh);if(mWidth &＃61;&＃61; 0){Log.e(TAG,"*********************");mWidth &＃61; getMeasuredWidth();paint2 &＃61; getPaint();//颜色渐变器gradient &＃61; new LinearGradient(0, 0, mWidth, 0, new int[]{Color.GRAY,Color.WHITE,Color.GRAY}, new float[]{0.3f,0.5f,1.0f}, Shader.TileMode.CLAMP);paint2.setShader(gradient);matrix &＃61; new Matrix();}}&＃64;Overrideprotected void onDraw(Canvas canvas) {super.onDraw(canvas);if(matrix !&＃61;null){deltaX &＃43;&＃61; mWidth / 5;if(deltaX > 2 * mWidth){deltaX &＃61; -mWidth;}}//关键代码通过矩阵的平移实现matrix.setTranslate(deltaX, 0);gradient.setLocalMatrix(matrix);postInvalidateDelayed(100);}
}