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 extends View { private Context context; //X軸起點 private float x; //Y軸起點 private float y; //畫筆 private final Paint paint = new Paint(); //路徑 private final Path path = new Path(); //畫布 private Canvas canvas; //生成的圖片 private Bitmap 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 interface Touch { void OnTouch(boolean isTouch); } private Touch touch; public SignatureView(Context context) { super(context); init(context); } public SignatureView(Context context, @Nullable AttributeSet attrs) { super(context, attrs); init(context); } public SignatureView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); init(context); } private void init(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); } @Override protected void onSizeChanged(int w, int h, int oldw, int oldh) { 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 = new Canvas(bitmap); canvas.drawColor(backgroundColor); isTouched = false; } @Override public boolean onTouchEvent(MotionEvent event) { if (touch != null) touch.OnTouch(true); switch (event.getAction()) { //手指按下 case MotionEvent.ACTION_DOWN: touchDwon(event); break; //手指移動 case MotionEvent.ACTION_MOVE: isTouched = true; if (touch != null) touch.OnTouch(false); touchMove(event); break; //手指抬起 case MotionEvent.ACTION_UP: canvas.drawPath(path, paint); path.reset(); break; } // 更新繪制 invalidate(); return true; } @Override protected void onDraw(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 void touchDwon(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 void touchMove(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 * * @param paintColor */ public void setPaintColor(int paintColor) { this.paintColor = paintColor; paint.setColor(paintColor); } /** * 設置畫筆寬度 * * @param paintWidth */ public void setPaintWidth(int paintWidth) { this.paintWidth = paintWidth; paint.setStrokeWidth(paintWidth); } /** * 設置畫板顏色 * * @param canvasColor */ public void setCanvasColor(int canvasColor) { this.backgroundColor = canvasColor; } /** * 清除畫板 */ public void clear() { 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 */ public Bitmap getBitmap() { setDrawingCacheEnabled(true); buildDrawingCache(); Bitmap bitmap = getDrawingCache(); setDrawingCacheEnabled(false); return bitmap; } /** * 是否有簽名 * * @return */ public Boolean getSigstatus() { return isTouched; } /** * 保存畫板 * * @param path 保存到路徑 */ @SuppressLint('WrongThread') public Boolean save(String path) throws IOException { Bitmap bitmap = this.bitmap; ByteArrayOutputStream bos = new ByteArrayOutputStream(); bitmap.compress(Bitmap.CompressFormat.PNG, 100, bos); byte[] buffer = bos.toByteArray(); if (buffer != null) { File file = new File(path); if (file.exists()) { file.delete(); } OutputStream outputStream = new FileOutputStream(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）

<?xml version='1.0' encoding='utf-8'?><LinearLayout xmlns:android='http://schemas.android.com/apk/res/android' android:layout_width='match_parent' android:layout_height='match_parent' android:orientation='vertical'> <!--自定義view的絕對路徑--> <com.example.customviewdemo.view.SignatureView android: android:layout_width='match_parent' android:layout_height='0dp' android:layout_weight='1' android:background='#fff' /> <LinearLayout android:layout_width='match_parent' android:layout_height='50dp' android:layout_margin='20dp' android:orientation='horizontal'> <Button android: android:layout_width='0dp' android:layout_height='match_parent' android:layout_weight='1' android:gravity='center' android:text='清除' /> <Button android: 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' /> <Button android: android:layout_width='0dp' android:layout_height='match_parent' android:layout_marginLeft='10dp' android:layout_weight='1' android:gravity='center' android:text='保存' /> </LinearLayout></LinearLayout>

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(); } }); }}

總結

到此這篇關于Android 自定義View手寫簽名并保存圖片的文章就介紹到這了,更多相關Android 自定義View手寫簽名并保存圖片 內容請搜索好吧啦網以前的文章或繼續瀏覽下面的相關文章希望大家以后多多支持好吧啦網！