Android EditText 搜索框 icon在中间

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类似这样EditText 搜索框，hiht 提示有一个icon并且text内容。

重写EditText ：

package mobi.truekey.weapp2.widget;import android.content.Context;import android.content.res.TypedArray;import android.graphics.Canvas;import android.graphics.Paint;import android.graphics.drawable.Drawable;import android.util.AttributeSet;import android.widget.EditText;import mobi.truekey.weapp2.R;public class SearchView extends EditText {    private float searchSize = 0;    private float textSize = 0;    private int textColor = 0xFF000000;    private Drawable mDrawable;    private Paint paint;    public SearchView(Context context, AttributeSet attrs) {        super(context, attrs);        InitResource(context, attrs);        InitPaint();    }    private void InitResource(Context context, AttributeSet attrs) {        TypedArray mTypedArray = context.obtainStyledAttributes(attrs, R.styleable.searchedit);        float density = context.getResources().getDisplayMetrics().density;        searchSize = mTypedArray.getDimension(R.styleable.searchedit_imagewidth, 18 * density + 0.5F);        textColor = mTypedArray.getColor(R.styleable.searchedit_textColor, 0xFF848484);        textSize = mTypedArray.getDimension(R.styleable.searchedit_textSize, 14 * density + 0.5F);        mTypedArray.recycle();    }    private void InitPaint() {        paint = new Paint(Paint.ANTI_ALIAS_FLAG);        paint.setColor(textColor);        paint.setTextSize(textSize);    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        DrawSearchIcon(canvas);    }    private void DrawSearchIcon(Canvas canvas) {        if (this.getText().toString().length() == 0) {            float textWidth = paint.measureText("搜索");            float textHeight = getFontLeading(paint);            float dx = (getWidth() - searchSize - textWidth - 8) / 2;            float dy = (getHeight() - searchSize) / 2;            canvas.save();            canvas.translate(getScrollX() + dx, getScrollY() + dy);            if (mDrawable != null) {                mDrawable.draw(canvas);            }            canvas.drawText("搜索", getScrollX() + searchSize + 8, getScrollY() + (getHeight() - (getHeight() - textHeight) / 2) - paint.getFontMetrics().bottom - dy, paint);            canvas.restore();        }    }    @Override    protected void onAttachedToWindow() {        super.onAttachedToWindow();        if (mDrawable == null) {            try {                mDrawable = getContext().getResources().getDrawable(R.drawable.search);                mDrawable.setBounds(0, 0, (int) searchSize, (int) searchSize);            } catch (Exception e) {            }        }    }    @Override    protected void onDetachedFromWindow() {        if (mDrawable != null) {            mDrawable.setCallback(null);            mDrawable = null;        }        super.onDetachedFromWindow();    }    public float getFontLeading(Paint paint) {        Paint.FontMetrics fm = paint.getFontMetrics();        return fm.bottom - fm.top;    }}

attr：

<declare-styleable name="searchedit">    <attr name="imagewidth" format="dimension" />    <attr name="textSize" format="dimension" />    <attr name="textColor" format="color" /></declare-styleable>

drawable背景：

<?xml version="1.0" encoding="utf-8"?><shape xmlns:android="http://schemas.android.com/apk/res/android">    <corners android:radius="6dp" />    <solid android:color="@color/white" /></shape>

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