Android实现长截屏功能

本文实例为大家分享了Android实现长截屏功能的具体代码，供大家参考，具体内容如下

1、MainActivity

public class MainActivity extends AppCompatActivity {
  ScrollView scrollView;
  String sdRoot = Environment.getExternalStorageDirectory().getPath();
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    scrollView = (ScrollView) findViewById(R.id.scroll);
    //权限
    int permission_write= ContextCompat.checkSelfPermission(this,
        Manifest.permission.WRITE_EXTERNAL_STORAGE);
    int permission_read=ContextCompat.checkSelfPermission(this,
        Manifest.permission.READ_EXTERNAL_STORAGE);
    if(permission_write!= PackageManager.PERMISSION_GRANTED
        || permission_read!=PackageManager.PERMISSION_GRANTED){
      Toast.makeText(this, "正在请求权限", Toast.LENGTH_SHORT).show();
      //申请权限，特征码自定义为1，可在回调时进行相关判断
      ActivityCompat.requestPermissions(this,new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE,Manifest.permission.READ_EXTERNAL_STORAGE},1);
    }
  }

  @Override
  public void onWindowFocusChanged(boolean hasFocus) {
    shootScrollView(scrollView, "sdRoot");

//    takeScreenshot();
    super.onWindowFocusChanged(hasFocus);
  }

  @Override
  protected void onResume() {
    super.onResume();
  }

  /**
   * 截取scrollview的屏幕
   * **/
  public static Bitmap getScrollViewBitmap(ScrollView scrollView, String picpath) {
    int h = 0;
    Bitmap bitmap;
    // 获取listView实际高度
    for (int i = 0; i < scrollView.getChildCount(); i++) {
      h += scrollView.getChildAt(i).getHeight();
      scrollView.getChildAt(i).setBackgroundColor(Color.parseColor("#ffffff"));
    }
    Log.d(TAG, "实际高度:" + h);
    Log.d(TAG, " 高度:" + scrollView.getHeight());
    // 创建对应大小的bitmap
    bitmap = Bitmap.createBitmap(scrollView.getWidth(), h,
        Bitmap.Config.ARGB_8888);
    final Canvas canvas = new Canvas(bitmap);
    scrollView.draw(canvas);
    // 测试输出
    FileOutputStream out = null;
    try {
      out = new FileOutputStream(picpath);
    } catch (FileNotFoundException e) {
      e.printStackTrace();
    }
    try {
      if (null != out) {
        bitmap.compress(Bitmap.CompressFormat.PNG, 100, out);
        out.flush();
        out.close();
      }
    } catch (IOException e) {
    }
    Log.d("TAG", "getScrollViewBitmap() returned: " + bitmap.getHeight());
    return bitmap;
  }

  private static String TAG = "Listview and ScrollView item 截图:";

  /**
   * 截图listview
   * **/
  public static Bitmap getListViewBitmap(ListView listView, String picpath) {
    int h = 0;
    Bitmap bitmap;
    // 获取listView实际高度
    for (int i = 0; i < listView.getChildCount(); i++) {
      h += listView.getChildAt(i).getHeight();
    }
    Log.d(TAG, "实际高度:" + h);
    Log.d(TAG, "list 高度:" + listView.getHeight());
    // 创建对应大小的bitmap
    bitmap = Bitmap.createBitmap(listView.getWidth(), h,
        Bitmap.Config.ARGB_8888);
    final Canvas canvas = new Canvas(bitmap);
    listView.draw(canvas);
    // 测试输出
    FileOutputStream out = null;
    try {
      out = new FileOutputStream(picpath);
    } catch (FileNotFoundException e) {
      e.printStackTrace();
    }
    try {
      if (null != out) {
        bitmap.compress(Bitmap.CompressFormat.PNG, 100, out);
        out.flush();
        out.close();
      }
    } catch (IOException e) {
    }
    return bitmap;
  }

  // 程序入口 截取ScrollView
  public static void shootScrollView(ScrollView scrollView, String picpath) {
//    ScreenShot.savePic(getScrollViewBitmap(scrollView, picpath), picpath);
    ScreenShot.saveMyBitmap(getScrollViewBitmap(scrollView, picpath), picpath);
  }

  // 程序入口 截取ListView
  public static void shootListView(ListView listView, String picpath) {
    ScreenShot.savePic(getListViewBitmap(listView,picpath), picpath);
  }

  private void takeScreenshot() {
    Date now = new Date();
    android.text.format.DateFormat.format("yyyy-MM-dd_hh:mm:ss", now);

    try {
      // image naming and path to include sd card appending name you choose for file
      String mPath = Environment.getExternalStorageDirectory().toString() + "/" + now + ".jpg";

      // create bitmap screen capture
      View v1 = getWindow().getDecorView().getRootView();
      v1.setDrawingCacheEnabled(true);
      Bitmap bitmap = Bitmap.createBitmap(v1.getDrawingCache());
      v1.setDrawingCacheEnabled(false);

      File imageFile = new File(mPath);

      FileOutputStream outputStream = new FileOutputStream(imageFile);
      int quality = 100;
      bitmap.compress(Bitmap.CompressFormat.JPEG, quality, outputStream);
      outputStream.flush();
      outputStream.close();

      openScreenshot(imageFile);
    } catch (Throwable e) {
      // Several error may come out with file handling or OOM
      e.printStackTrace();
    }
  }

  private void openScreenshot(File imageFile) {
    Intent intent = new Intent();
    intent.setAction(Intent.ACTION_VIEW);
    Uri uri = Uri.fromFile(imageFile);
    intent.setDataAndType(uri, "image/*");
    startActivity(intent);
  }
}

2.ScreenShot

public class ScreenShot{
  // 获取指定Activity的截屏，保存到png文件
  public static Bitmap takeScreenShot(Activity activity) {
    // View是你需要截图的View
    View view = activity.getWindow().getDecorView();
    view.setDrawingCacheEnabled(true);
    view.buildDrawingCache();
    Bitmap b1 = view.getDrawingCache();

    // 获取状态栏高度
    Rect frame = new Rect();
    activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);
    int statusBarHeight = frame.top;
    System.out.println(statusBarHeight);

    // 获取屏幕长和高
    int width = activity.getWindowManager().getDefaultDisplay().getWidth();
    int height = activity.getWindowManager().getDefaultDisplay()
        .getHeight();
    // 去掉标题栏
    // Bitmap b = Bitmap.createBitmap(b1, 0, 25, 320, 455);
    Bitmap b = Bitmap.createBitmap(b1, 0, statusBarHeight, width, height
        - statusBarHeight);
    view.destroyDrawingCache();
    return b;
  }

  // 保存到sdcard
  public static void savePic(Bitmap b, String strFileName) {
    FileOutputStream fos = null;
    Log.d("TAG", "savePic() returned: " );
    try {
      fos = new FileOutputStream(strFileName);
      if (null != fos) {
        b.compress(Bitmap.CompressFormat.PNG, 90, fos);
        Log.d("TAG", "savePic() returned:  " + b.getHeight());
        fos.flush();
        fos.close();
      }
    } catch (FileNotFoundException e) {
      e.printStackTrace();
    } catch (IOException e) {
      e.printStackTrace();
    }
  }

  // 程序入口 截取当前屏幕
  public static void shootLoacleView(Activity a, String picpath) {
    ScreenShot.savePic(ScreenShot.takeScreenShot(a), picpath);
  }

  /**
   * 保存bitmap到SD卡
   * @param bitName 保存的名字
   * @param mBitmap 图片对像
   * return 生成压缩图片后的图片路径
   */
  @SuppressLint("SdCardPath")
  public static String saveMyBitmap(Bitmap mBitmap, String bitName) {
    String path = Environment.getExternalStorageDirectory()+"/"+bitName+".png";
    File f = new File(path);

    try {
      f.createNewFile();
    } catch (IOException e) {
      System.out.println("在保存图片时出错：" + e.toString());
    }
    FileOutputStream fOut = null;
    try {
      fOut = new FileOutputStream(f);
    } catch (FileNotFoundException e) {
      e.printStackTrace();
    }
    try {
      mBitmap.compress(Bitmap.CompressFormat.PNG, 100, fOut);
    } catch (Exception e) {
      return "create_bitmap_error";
    }
    try {
      fOut.flush();
    } catch (IOException e) {
      e.printStackTrace();
    }
    try {
      fOut.close();
    } catch (IOException e) {
      e.printStackTrace();
    }
//    File file = new File(Environment.getExternalStorageDirectory(), System.currentTimeMillis()+".jpg");
//    FileOutputStream out = null;
//    try {
//      out = new FileOutputStream(file);
//      mBitmap.compress(Bitmap.CompressFormat.JPEG, 90, out);
//      System.out.println("___________保存的__sd___下_______________________");
//    } catch (FileNotFoundException e) {
//      e.printStackTrace();
//    }
//    try {
//      out.flush();
//      out.close();
//    } catch (IOException e) {
//      e.printStackTrace();
//    }
    return path;
  //  Toast.makeText(HahItemActivity.this,"保存已经至"+Environment.getExternalStorageDirectory()+"下", Toast.LENGTH_SHORT).show();
  }
}

3.xml

<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:app="http://schemas.android.com/apk/res-auto"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:id="@+id/scroll"
  tools:context=".MainActivity">

  <LinearLayout
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">
  </LinearLayout>

</ScrollView>

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持我们。