java 手写签名_Android 自定义View手写签名并保存图片
GIF壓縮有問題，運行很順滑！！！
1.自定義View——支持設置畫筆顏色，畫筆寬度，畫板顏色，清除畫板，檢查是否有簽名，保存畫板圖片(復制粘貼可直接使用)
/*** Created by YyyyQ on 2020/3/5.
* 電子簽名*/
public class SignatureView extendsView {privateContext context;//X軸起點
private floatx;//Y軸起點
private floaty;//畫筆
private final Paint paint = newPaint();//路徑
private final Path path = newPath();//畫布
privateCanvas canvas;//生成的圖片
privateBitmap bitmap;//畫筆的寬度
private int paintWidth = 10;//簽名顏色
private int paintColor =Color.BLACK;//背景顏色
private int backgroundColor =Color.WHITE;//是否已經簽名
private boolean isTouched = false;//簽名開始與結束
public interfaceTouch {void OnTouch(booleanisTouch);
}privateTouch touch;publicSignatureView(Context context) {super(context);
init(context);
}publicSignatureView(Context context, @Nullable AttributeSet attrs) {super(context, attrs);
init(context);
}public SignatureView(Context context, @Nullable AttributeSet attrs, intdefStyleAttr) {super(context, attrs, defStyleAttr);
init(context);
}private voidinit(Context context) {this.context =context;//抗鋸齒
paint.setAntiAlias(true);//樣式
paint.setStyle(Paint.Style.STROKE);//畫筆顏色
paint.setColor(paintColor);//畫筆寬度
paint.setStrokeWidth(paintWidth);
}
@Overrideprotected void onSizeChanged(int w, int h, int oldw, intoldh) {super.onSizeChanged(w, h, oldw, oldh);//創建于view大小一致的bitmap
bitmap =Bitmap.createBitmap(getWidth(), getHeight(), Bitmap.Config.ARGB_8888);
canvas= newCanvas(bitmap);
canvas.drawColor(backgroundColor);
isTouched= false;
}
@Overridepublic booleanonTouchEvent(MotionEvent event) {if (touch != null) touch.OnTouch(true);switch(event.getAction()) {//手指按下
caseMotionEvent.ACTION_DOWN:
touchDwon(event);break;//手指移動
caseMotionEvent.ACTION_MOVE:
isTouched= true;if (touch != null) touch.OnTouch(false);
touchMove(event);break;//手指抬起
caseMotionEvent.ACTION_UP:
canvas.drawPath(path, paint);
path.reset();break;
}//更新繪制
invalidate();return true;
}
@Overrideprotected voidonDraw(Canvas canvas) {super.onDraw(canvas);//畫此次筆畫之前的簽名
canvas.drawBitmap(bitmap, 0, 0, paint);//通過畫布繪制多點形成的圖形
canvas.drawPath(path, paint);
}//手指按下的方法
private voidtouchDwon(MotionEvent event) {//重置繪制路徑
path.reset();float downX =event.getX();float downY =event.getY();
x=downX;
y=downY;//繪制起點
path.moveTo(downX, downY);
}//手指滑動的方法
private voidtouchMove(MotionEvent event) {//當前的x,y坐標點
final float moveX =event.getX();final float moveY =event.getY();//之前的x,y坐標點
final float previousX =x;final float previousY =y;//獲取絕對值
final float dx = Math.abs(moveX -previousX);final float dy = Math.abs(moveY -previousY);if (dx >= 3 || dy >= 3) {float cX = (moveX + previousX) / 2;float cY = (moveY + previousY) / 2;
path.quadTo(previousX, previousY, cX, cY);
x=moveX;
y=moveY;
}
}/*** 設置畫筆顏色
*
*@parampaintColor*/
public void setPaintColor(intpaintColor) {this.paintColor =paintColor;
paint.setColor(paintColor);
}/*** 設置畫筆寬度
*
*@parampaintWidth*/
public void setPaintWidth(intpaintWidth) {this.paintWidth =paintWidth;
paint.setStrokeWidth(paintWidth);
}/*** 設置畫板顏色
*
*@paramcanvasColor*/
public void setCanvasColor(intcanvasColor) {this.backgroundColor =canvasColor;
}/*** 清除畫板*/
public voidclear() {if (canvas != null) {
isTouched= false;//更新畫板
paint.setColor(paintColor);
paint.setStrokeWidth(paintWidth);
canvas.drawColor(backgroundColor, PorterDuff.Mode.CLEAR);
invalidate();
}
}/*** 獲取畫板的Bitmap
*
*@return
*/
publicBitmap getBitmap() {
setDrawingCacheEnabled(true);
buildDrawingCache();
Bitmap bitmap=getDrawingCache();
setDrawingCacheEnabled(false);returnbitmap;
}/*** 是否有簽名
*
*@return
*/
publicBoolean getSigstatus() {returnisTouched;
}/*** 保存畫板
*
*@parampath 保存到路徑*/@SuppressLint("WrongThread")public Boolean save(String path) throwsIOException {
Bitmap bitmap= this.bitmap;
ByteArrayOutputStream bos= newByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.PNG,100, bos);byte[] buffer =bos.toByteArray();if (buffer != null) {
File file= newFile(path);if(file.exists()) {
file.delete();
}
OutputStream outputStream= newFileOutputStream(file);
outputStream.write(buffer);
outputStream.close();return true;
}else{return false;
}
}
}
2.xml布局引用自定義View(注意包名)
android:id="@+id/signature"android:layout_width="match_parent"android:layout_height="0dp"android:layout_weight="1"android:background="#fff" />
android:layout_width="match_parent"android:layout_height="50dp"android:layout_margin="20dp"android:orientation="horizontal">
android:id="@+id/clear"android:layout_width="0dp"android:layout_height="match_parent"android:layout_weight="1"android:gravity="center"android:text="清除" />
android:id="@+id/isSignature"android:layout_width="0dp"android:layout_height="match_parent"android:layout_marginLeft="10dp"android:layout_weight="1"android:gravity="center"android:text="是否簽名" />
android:id="@+id/save"android:layout_width="0dp"android:layout_height="match_parent"android:layout_marginLeft="10dp"android:layout_weight="1"android:gravity="center"android:text="保存" />
3.Activity調用
/**
* Created by YyyyQ on 2020/3/9.
*/
public class SignatureActivity extends AppCompatActivity {
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_signature);
SignatureView signatureView = findViewById(R.id.signature);
//設置畫筆顏色(可以不設置--默認畫筆寬度10,畫筆顏色黑,背景顏色白)
signatureView.setPaintColor(Color.BLACK);
signatureView.setPaintWidth(20);
signatureView.setCanvasColor(Color.WHITE);
//清除
Button clear = findViewById(R.id.clear);
clear.setOnClickListener(view -> {
signatureView.clear();
//設置畫筆顏色(可以不設置--默認畫筆寬度10,畫筆顏色黑,背景顏色白)
signatureView.setPaintColor(Color.BLACK);
signatureView.setPaintWidth(20);
signatureView.setCanvasColor(Color.WHITE);
});
//是否含有簽名
Button isSignature = findViewById(R.id.isSignature);
isSignature.setOnClickListener(view -> {
if (signatureView.getSigstatus()) {
Toast.makeText(SignatureActivity.this, "有簽名", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(SignatureActivity.this, "無簽名", Toast.LENGTH_SHORT).show();
}
});
//保存
Button save = findViewById(R.id.save);
save.setOnClickListener(view -> {
try {
if (signatureView.save("/sdcard/YyyyQ.png")) {
Toast.makeText(SignatureActivity.this, "保存成功", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(SignatureActivity.this, "保存失敗", Toast.LENGTH_SHORT).show();
}
} catch (IOException e) {
e.printStackTrace();
}
});
}
}
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