如何将转换的LinearLayout图像? [英] How to convert a LinearLayout to image?

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本文介绍了如何将转换的LinearLayout图像?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我尝试以下code转换的的LinearLayout 图像:

 公共无效的onCreate(捆绑savedInstanceState){
    super.onCreate(savedInstanceState);
    的setContentView(R.layout.main);    的LinearLayout LYT =(的LinearLayout)findViewById(R.id.lyt);
    lyt.setDrawingCacheEnabled(真);
    lyt.buildDrawingCache(真);    位图B = Bitmap.createBitmap(lyt.getDrawingCache());    ImageView的IMG =(ImageView的)findViewById(R.id.imageView1);
    img.setImageBitmap(二);}

但我得到了 NullPointerException异常

 位图B = Bitmap.createBitmap(lyt.getDrawingCache());

在布局XML是:

 <?XML版本=1.0编码=UTF-8&GT?;
< LinearLayout中的xmlns:机器人=htt​​p://schemas.android.com/apk/res/android
    机器人:layout_width =FILL_PARENT
    机器人:layout_height =FILL_PARENT
    机器人:方向=垂直>
    <的LinearLayout
        机器人:ID =@ + ID / LYT
        机器人:layout_width =match_parent
        机器人:layout_height =WRAP_CONTENT
        机器人:方向=垂直>        <按钮
            机器人:ID =@ + ID /按钮1
            机器人:layout_width =WRAP_CONTENT
            机器人:layout_height =WRAP_CONTENT
            机器人:文字=按钮1/>        <按钮
            机器人:ID =@ + ID /按钮3
            机器人:layout_width =WRAP_CONTENT
            机器人:layout_height =WRAP_CONTENT
            机器人:文字=按钮2/>        <按钮
            机器人:ID =@ + ID /按钮2
            机器人:layout_width =WRAP_CONTENT
            机器人:layout_height =WRAP_CONTENT
            机器人:文字=按钮3/>    < / LinearLayout中>    < ImageView的
        机器人:ID =@ + ID / imageView1
        机器人:layout_width =WRAP_CONTENT
        机器人:layout_height =WRAP_CONTENT
        机器人:SRC =@绘制/ ic_launcher/>< / LinearLayout中>


解决方案

尝试下面code,它的工作原理

添加下面的权限清单中

 <使用许可权的android:NAME =android.permission.WRITE_EXTERNAL_STORAG​​E/>

MainActivity.java

 公共类MainActivity扩展活动实现OnClickListener {
私人的LinearLayout的LinearLayout;
私人按钮saveBtn;@覆盖
公共无效的onCreate(捆绑savedInstanceState){
    super.onCreate(savedInstanceState);
    的setContentView(R.layout.main);
    的LinearLayout =(的LinearLayout)findViewById(R.id.linearLayout_view);
    saveBtn =(按钮)findViewById(R.id.save_btn);
    saveBtn.setOnClickListener(本);
}@覆盖
公共无效的onClick(视图v){
    INT ID = v.getId();
    开关(ID){
    案例R.id.save_btn:
        文件fil​​e = saveBitMap(这一点,LinearLayout中); //其中查看您想通过这一观点作为参数
        如果(文件!= NULL){
            Log.i(TAG,绘图保存到画廊!);
        }其他{
            Log.i(TAG,!哎呀图像无法保存。);
        }
        打破;
    默认:
        打破;
    }私人文件saveBitMap(上下文的背景下,查看drawView){
    文件pictureFileDir =新的文件(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),Handcare);
    如果(!pictureFileDir.exists()){
        布尔isDirectoryCreated = pictureFileDir.mkdirs();
        如果(!isDirectoryCreated)
            Log.i(ATG,无法创建目录保存图像);
        返回null;
    }
    字符串文件名= pictureFileDir.getPath()+文件分割符+ System.currentTimeMillis的()+JPG;
    文件PictureFile的=新的文件(文件名);
    位图位图= getBitmapFromView(drawView);
    尝试{
        pictureFile.createNewFile();
        FileOutputStream中的ostream =新的FileOutputStream(PictureFile的);
        bitmap.com preSS(比较pressFormat.PNG,100,ostream的);
        oStream.flush();
        oStream.close();
    }赶上(IOException异常五){
        e.printStackTrace();
        Log.i(TAG,有保存图像的问题。);
    }
        scanGallery(上下文,pictureFile.getAbsolutePath());
    PictureFile的回报;
}
//从视图中创建位图并返回
私人位图getBitmapFromView(查看视图){
    //定义一个位图的大小相同的观点
    位图returnedBitmap = Bitmap.createBitmap(view.getWidth(),view.getHeight(),Bitmap.Config.ARGB_8888);
    //绑定一个画布它
    帆布帆布=新的Canvas(returnedBitmap);
    //获取视图的背景
    可绘制bgDrawable = view.getBackground();
    如果(bgDrawable!= NULL){
        //有背景的绘制,然后绘制在画布上
        bgDrawable.draw(画布);
    }其他{
        //没有背景的绘制,然后绘制白色背景的画布上
        canvas.drawColor(Color.WHITE);
    }
    //绘制视图在画布上
    view.draw(画布);
    //返回位图
    返回returnedBitmap;
}
//用于扫描图库
私人无效scanGallery(上下文CNTX,字符串路径){
    尝试{
        MediaScannerConnection.scanFile(CNTX,新的String [] {}路径,空,新MediaScannerConnection.OnScanCompletedListener(){
            公共无效onScanCompleted(字符串路径,开放的URI){
            }
        });
    }赶上(例外五){
        e.printStackTrace();
    }
}

}

I tried the following code to convert the LinearLayout to image:

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    LinearLayout lyt = (LinearLayout) findViewById(R.id.lyt);
    lyt.setDrawingCacheEnabled(true);
    lyt.buildDrawingCache(true);

    Bitmap b = Bitmap.createBitmap(lyt.getDrawingCache());

    ImageView img = (ImageView) findViewById(R.id.imageView1);
    img.setImageBitmap(b);

}

but I got NullPointerException in :

Bitmap b = Bitmap.createBitmap(lyt.getDrawingCache());

where the layout XML is :

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >


    <LinearLayout
        android:id="@+id/lyt"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical" >

        <Button
            android:id="@+id/button1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Button 1" />

        <Button
            android:id="@+id/button3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Button 2" />

        <Button
            android:id="@+id/button2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Button 3" />

    </LinearLayout>

    <ImageView
        android:id="@+id/imageView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/ic_launcher" />

</LinearLayout>

解决方案

Try below code, it works

Add below permission in manifest

 <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

MainActivity.java

public class MainActivity extends Activity implements OnClickListener{
private LinearLayout linearLayout;
private Button saveBtn;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    linearLayout = (LinearLayout) findViewById(R.id.linearLayout_view);
    saveBtn = (Button) findViewById(R.id.save_btn);
    saveBtn.setOnClickListener(this);
}

@Override
public void onClick(View v) {
    int id = v.getId();
    switch (id) {
    case R.id.save_btn:
        File file = saveBitMap(this, linearLayout);    //which view you want to pass that view as parameter
        if (file != null) {
            Log.i("TAG", "Drawing saved to the gallery!");
        } else {
            Log.i("TAG", "Oops! Image could not be saved.");
        }
        break;
    default:
        break;
    }

private File saveBitMap(Context context, View drawView){
    File pictureFileDir = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),"Handcare");
    if (!pictureFileDir.exists()) {
        boolean isDirectoryCreated = pictureFileDir.mkdirs();
        if(!isDirectoryCreated)
            Log.i("ATG", "Can't create directory to save the image");
        return null;
    }
    String filename = pictureFileDir.getPath() +File.separator+ System.currentTimeMillis()+".jpg";
    File pictureFile = new File(filename);
    Bitmap bitmap =getBitmapFromView(drawView);
    try {
        pictureFile.createNewFile();
        FileOutputStream oStream = new FileOutputStream(pictureFile);
        bitmap.compress(CompressFormat.PNG, 100, oStream);
        oStream.flush();
        oStream.close();
    } catch (IOException e) {
        e.printStackTrace();
        Log.i("TAG", "There was an issue saving the image.");
    }       
        scanGallery( context,pictureFile.getAbsolutePath());
    return pictureFile;
}
//create bitmap from view and returns it
private Bitmap getBitmapFromView(View view) {
    //Define a bitmap with the same size as the view
    Bitmap returnedBitmap = Bitmap.createBitmap(view.getWidth(), view.getHeight(),Bitmap.Config.ARGB_8888);
    //Bind a canvas to it
    Canvas canvas = new Canvas(returnedBitmap);
    //Get the view's background
    Drawable bgDrawable =view.getBackground();
    if (bgDrawable!=null) {
        //has background drawable, then draw it on the canvas
        bgDrawable.draw(canvas);
    }   else{
        //does not have background drawable, then draw white background on the canvas
        canvas.drawColor(Color.WHITE);
    }
    // draw the view on the canvas
    view.draw(canvas);
    //return the bitmap
    return returnedBitmap;
}
// used for scanning gallery
private void scanGallery(Context cntx, String path) {
    try {
        MediaScannerConnection.scanFile(cntx, new String[] { path },null, new MediaScannerConnection.OnScanCompletedListener() {
            public void onScanCompleted(String path, Uri uri) {
            }
        });
    } catch (Exception e) {
        e.printStackTrace();
    }
}

}

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