点击按钮
WritePadDialog mWritePadDialog = new WritePadDialog(activity, new WritePadDialog.WriteDialogListener() {
@Override
public void onPaintDone(Object object) {
mSignBitmap = (Bitmap) object;
createSignFile();
}
});
mWritePadDialog.show();
画板对框
public class WritePadDialog extends Dialog {
private Context mContext;
private WriteDialogListener mWriteDialogListener;
private PaintDrawingboard mPaintView;
private FrameLayout mFrameLayout;
private Button mBtnOK, mBtnClear, mBtnCancel;
public WritePadDialog(Context context,WriteDialogListener writeDialogListener) {
super(context);
this.mContext = context;
this.mWriteDialogListener = writeDialogListener;
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE); //无标题
setContentView(R.layout.write_pad);
mFrameLayout = findViewById(R.id.tablet_view);
// 获取屏幕尺寸
DisplayMetrics mDisplayMetrics = new DisplayMetrics();
getWindow().getWindowManager().getDefaultDisplay().getMetrics(mDisplayMetrics);
int screenWidth = mDisplayMetrics.widthPixels;
int screenHeight = mDisplayMetrics.heightPixels;
mPaintView = new PaintDrawingboard(mContext, screenWidth, screenHeight);
mFrameLayout.addView(mPaintView);
mPaintView.requestFocus();
mBtnOK = findViewById(R.id.write_pad_ok);
mBtnOK.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (mPaintView.getPath().isEmpty()) {
Toast.makeText(mContext, "请输入签名", Toast.LENGTH_SHORT).show();
return;
}
mWriteDialogListener.onPaintDone(mPaintView.getPaintBitmap());
dismiss();
}
});
mBtnClear = (Button) findViewById(R.id.write_pad_clear);
mBtnClear.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mPaintView.clear();
}
});
}
public interface WriteDialogListener {
public void onPaintDone(Object object);
}
}
画板功能
public class PaintDrawingboard extends View {
private Paint mPaint;
private Path mPath;
private Bitmap mBitmap;
private Canvas mCanvas;
private int screenWidth, screenHeight;
private float currentX, currentY;
public PaintDrawingboard(Context context, int screenWidth, int screenHeight) {
super(context);
this.screenWidth = screenWidth;
this.screenHeight = screenHeight;
init();
}
private void init() {
mPaint = new Paint();
mPaint.setAntiAlias(true); // 去除锯齿
mPaint.setStrokeWidth(5);
mPaint.setStyle(Paint.Style.STROKE);
mPaint.setColor(Color.BLACK);
mPath = new Path();
mBitmap = Bitmap.createBitmap(screenWidth, screenHeight, Bitmap.Config.ARGB_8888);
mCanvas = new Canvas(mBitmap);
// mCanvas.drawColor(Color.WHITE);
}
@Override
protected void onDraw(Canvas canvas) {
canvas.drawBitmap(mBitmap, 0, 0, null);
canvas.drawPath(mPath, mPaint);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
float x = event.getX();
float y = event.getY();
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
currentX = x;
currentY = y;
mPath.moveTo(currentX, currentY);
break;
case MotionEvent.ACTION_MOVE:
currentX = x;
currentY = y;
mPath.quadTo(currentX, currentY, x, y); // 画线
break;
case MotionEvent.ACTION_UP:
mCanvas.drawPath(mPath, mPaint);
break;
}
invalidate();
return true;
}
public Bitmap getPaintBitmap() {
return resizeImage(mBitmap, 320, 480);
}
public Path getPath() {
return mPath;
}
// 缩放
public Bitmap resizeImage(Bitmap bitmap, int width, int height) {
int originWidth = bitmap.getWidth();
int originHeight = bitmap.getHeight();
float scaleWidth = ((float) width) / originWidth;
float scaleHeight = ((float) height) / originHeight;
Matrix matrix = new Matrix();
matrix.postScale(scaleWidth, scaleHeight);
Bitmap resizedBitmap = Bitmap.createBitmap(bitmap, 0, 0, originWidth, originHeight, matrix, true);
return resizedBitmap;
}
//清除画板
public void clear() {
if (mCanvas != null) {
mPath.reset();
mCanvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR);
invalidate();
}
}
}
layout文件
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
<FrameLayout
android:id="@+id/tablet_view"
android:layout_width="fill_parent"
android:layout_height="300dp" />
<TextView
android:id="@+id/divider2"
android:layout_width="match_parent"
android:layout_height="0.3dp"
android:layout_below="@id/tv_pay_money_type"
android:background="@color/colore9e9e9" />
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="@color/color_f6f6f6">
<Button
android:id="@+id/write_pad_ok"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="@color/white"
android:text="确定" />
<Button
android:id="@+id/write_pad_clear"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="@color/white"
android:text="清除" />
</LinearLayout>
</LinearLayout>