android實現手寫簽名功能
阿新 • • 發佈:2020-01-07
本文例項為大家分享了android手寫簽名展示的具體程式碼,供大家參考,具體內容如下
程式碼簡單,就不發demo了,直接貼程式碼
package com.xx; import android.content.Context; import android.graphics.Bitmap; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.Path; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.view.MotionEvent; import android.view.View; import android.widget.Button; import android.widget.FrameLayout; import android.widget.ImageView; import com.xx.R; /** * Description: 簽名類 * Copyright: Copyright (c)2018 * Company: * author: Corwin * version: 1.0 * date: 2018/9/5 18:32 * Modification History: * Date Author Version Description * ------------------------------------------------------------------ * 2018/9/5 Corwin 1.0 1.0 Version */ public class SignatureActivity extends AppCompatActivity { private ImageView imageSign; private SignatureView mView; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_signature); imageSign = findViewById(R.id.iv_sign); FrameLayout frameLayout = findViewById(R.id.fl_view); mView = new SignatureView(this); frameLayout.addView(mView); mView.requestFocus(); Button btnClear = findViewById(R.id.btn_clear); btnClear.setOnClickListener((v) -> { mView.clear(); }); Button btnOk = findViewById(R.id.btn_ok); btnOk.setOnClickListener((v) -> { Bitmap imageBitmap = mView.getCachebBitmap(); imageSign.setImageBitmap(imageBitmap); }); } /** * 自定義簽名控制元件 */ class SignatureView extends View { //畫筆 private Paint paint; //畫布 private Canvas cacheCanvas; //點陣圖 private Bitmap cachebBitmap; //圖片儲存路徑 private Path path; //點陣圖快取 public Bitmap getCachebBitmap() { return cachebBitmap; } public SignatureView(Context context) { super(context); init(); } /** * 初始化 */ private void init() { //設定畫筆 paint = new Paint(); paint.setAntiAlias(true); paint.setStrokeWidth(3); paint.setStyle(Paint.Style.STROKE); paint.setColor(Color.BLACK); path = new Path(); //建立點陣圖 cachebBitmap = Bitmap.createBitmap(10,10,Bitmap.Config.ARGB_8888); //用自定義點陣圖構建畫布 cacheCanvas = new Canvas(cachebBitmap); //設定畫布為白色 cacheCanvas.drawColor(Color.WHITE); } /** * 清除畫板,重置畫筆 */ public void clear() { if (cacheCanvas != null) { paint.setColor(Color.WHITE); cacheCanvas.drawPaint(paint); paint.setColor(Color.BLACK); cacheCanvas.drawColor(Color.WHITE); invalidate(); } } @Override protected void onDraw(Canvas canvas) { canvas.drawBitmap(cachebBitmap,null); canvas.drawPath(path,paint); } @Override protected void onSizeChanged(int w,int h,int oldw,int oldh) { int curW = cachebBitmap != null ? cachebBitmap.getWidth() : 0; int curH = cachebBitmap != null ? cachebBitmap.getHeight() : 0; if (curW >= w && curH >= h) { return; } if (curW < w) curW = w; if (curH < h) curH = h; Bitmap newBitmap = Bitmap.createBitmap(curW,curH,Bitmap.Config.ARGB_8888); Canvas newCanvas = new Canvas(); newCanvas.setBitmap(newBitmap); if (cachebBitmap != null) { newCanvas.drawBitmap(cachebBitmap,null); } cachebBitmap = newBitmap; cacheCanvas = newCanvas; } private float cur_x,cur_y; @Override public boolean onTouchEvent(MotionEvent event) { float x = event.getX(); float y = event.getY(); switch (event.getAction()) { case MotionEvent.ACTION_DOWN: { cur_x = x; cur_y = y; path.moveTo(cur_x,cur_y); break; } case MotionEvent.ACTION_MOVE: { path.quadTo(cur_x,cur_y,x,y); cur_x = x; cur_y = y; break; } case MotionEvent.ACTION_UP: { cacheCanvas.drawPath(path,paint); path.reset(); break; } } invalidate(); return true; } } }
佈局檔案:
<?xml version="1.0"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <ImageView android:id="@+id/iv_sign" android:layout_width="match_parent" android:layout_height="0dp" android:layout_gravity="center" android:layout_marginBottom="3dp" android:layout_weight="1" android:background="@color/white" /> <FrameLayout android:id="@+id/fl_view" android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="1" android:background="@color/white" /> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:background="@android:drawable/bottom_bar" android:paddingTop="3dp" > <Button android:id="@+id/btn_ok" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:text="確定" /> <Button android:id="@+id/btn_clear" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:text="清除" /> </LinearLayout> </LinearLayout>
以上就是本文的全部內容,希望對大家的學習有所幫助,也希望大家多多支援我們。