Scrollview SignatureView 内部不起作用

Posted 2023-05-07

【中文标题】Scrollview SignatureView 内部不起作用

【英文标题】：Inside Scrollview SignatureView is not working

【发布时间】：2016-08-24 13:33:34

【问题描述】：

我将Signatureview 放入android Scrollview。

但是在SignatureView 上写东西时，上下滚动我无法写下我的标志。

当SignatureView被触摸时如何禁用Scrollview

Link to referred signature

签名.xml

    <?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:orientation="vertical"
        android:layout_
        android:layout_
        android:paddingBottom="@dimen/activity_vertical_margin"
        android:paddingLeft="@dimen/activity_horizontal_margin"
        android:paddingRight="@dimen/activity_horizontal_margin"
        android:paddingTop="@dimen/activity_vertical_margin"
        >

<ScrollView
            android:id="@+id/scrollView1"
            android:layout_
            android:layout_
            android:isScrollContainer="false"
            android:paddingBottom="30dp"
            android:paddingLeft="2dp"
            android:paddingRight="2dp"
            android:scrollbars="none">

            <LinearLayout
                android:layout_
                android:layout_
                android:orientation="vertical">


        <com.kyanogen.signatureview.SignatureView
            xmlns:sign="http://schemas.android.com/apk/res-auto"
            android:id="@+id/signature_view"
            android:layout_
            android:layout_
            android:minHeight="250dp"
            android:layout_weight="1"
            sign:penSize="5dp"
            sign:backgroundColor="#ffffff"
            sign:penColor="#000000"
            sign:enableSignature="true"/>
    <LinearLayout
        android:layout_
        android:layout_
        android:weightSum="2">
        <Button
            android:layout_
            android:layout_
            android:id="@+id/clearSignButton"
            android:layout_weight="1"
            android:text="clear"/>
        <Button
            android:layout_
            android:layout_
            android:id="@+id/saveSignButton"
            android:layout_weight="1"
            android:text="save"/>
    </LinearLayout>
    </LinearLayout>
 </LinearLayout>
</Scrolview>

Main.java

package com.example.parsaniahardik.signaturedemo;

import android.graphics.Bitmap;
import android.media.MediaScannerConnection;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;

import com.kyanogen.signatureview.SignatureView;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Calendar;

public class MainActivity extends AppCompatActivity 

    Bitmap bitmap;
    Button clear,save;
    SignatureView signatureView;
    String path;
    private static final String IMAGE_DIRECTORY = "/signdemo";
    @Override
    protected void onCreate(Bundle savedInstanceState) 
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        signatureView =  (SignatureView) findViewById(R.id.signature_view);
        clear = (Button) findViewById(R.id.clear);
        save = (Button) findViewById(R.id.save);

        clear.setOnClickListener(new View.OnClickListener() 
            @Override
            public void onClick(View v) 
                signatureView.clearCanvas();
            
        );

        save.setOnClickListener(new View.OnClickListener() 
            @Override
            public void onClick(View v) 
                bitmap = signatureView.getSignatureBitmap();
                path = saveImage(bitmap);
            
        );


    
    public String saveImage(Bitmap myBitmap) 
        ByteArrayOutputStream bytes = new ByteArrayOutputStream();
        myBitmap.compress(Bitmap.CompressFormat.JPEG, 90, bytes);
        File wallpaperDirectory = new File(
                Environment.getExternalStorageDirectory() + IMAGE_DIRECTORY /*iDyme folder*/);
        // have the object build the directory structure, if needed.
        if (!wallpaperDirectory.exists()) 
            wallpaperDirectory.mkdirs();
            Log.d("hhhhh",wallpaperDirectory.toString());
        

        try 
            File f = new File(wallpaperDirectory, Calendar.getInstance()
                    .getTimeInMillis() + ".jpg");
            f.createNewFile();
            FileOutputStream fo = new FileOutputStream(f);
            fo.write(bytes.toByteArray());
            MediaScannerConnection.scanFile(MainActivity.this,
                    new String[]f.getPath(),
                    new String[]"image/jpeg", null);
            fo.close();
            Log.d("TAG", "File Saved::--->" + f.getAbsolutePath());

            return f.getAbsolutePath();
         catch (IOException e1) 
            e1.printStackTrace();
        
        return "";

    

【问题讨论】：

signatureview 在 Linearlayout 而不是 Scrollview 内？

滚动视图在哪里？我在 Sign.xml 中看不到滚动视图

@ViramP 查看我更新的问题

抱歉，我检查了你的代码，一切正常。

【参考方案1】：

当你要签名时需要拦截滚动事件当签名被触摸时。当你在签名区域之外时返回正常状态：scrollView拦截滚动事件。 在控制器的 onCreate 中添加以下内容：

signatureView.setOnTouchListener(new View.OnTouchListener()
        @Override
        public boolean onTouch(View view, MotionEvent motionEvent) 
            int action = motionEvent.getAction();
            switch (action)
                case MotionEvent.ACTION_DOWN:
                    // Disable the scroll view to intercept the touch event
                    scrollView1.requestDisallowInterceptTouchEvent(true);
                    return false;
                case MotionEvent.ACTION_UP:
                    // Allow scroll View to interceot the touch event
                    scrollView1.requestDisallowInterceptTouchEvent(false);
                    return true;
                case MotionEvent.ACTION_MOVE:
                    scrollView1.requestDisallowInterceptTouchEvent(true);
                    return false;
                default:
                    return true;
            
        
    );

【参考方案2】：

您必须在此 SignatureView 中拦截触摸事件。最好的方法是继承它并覆盖 onTouchEvent：

public class MySignatureView extends SignatureView 
    @Override
    public boolean onTouchEvent(MotionEvent event) 
        // intercept touch event here, so it's not passed to ScrollView
        super.onTouchEvent(event);
        return false;
    

然后，当然在您的布局中将 SignatureView 更改为 MySignatureView。

<com.your.package.name.MySignatureView
        xmlns:sign="http://schemas.android.com/apk/res-auto"
        android:id="@+id/signature_view"
        android:layout_
        android:layout_
        android:minHeight="250dp"
        android:layout_weight="1"
        sign:penSize="5dp"
        sign:backgroundColor="#ffffff"
        sign:penColor="#000000"
        sign:enableSignature="true"/>

【讨论】：

我必须在哪里保留该类 Mysignatureview？

随心所欲。您可以使用匿名类、内部类或完全独立的类来做到这一点。

你能告诉我吗，在我的代码中我必须修改你建议的内容，否则在scrollview中添加签名捕获的完整代码