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

relativeLayout = (RelativeLayout) findViewById(R.id.layout_rl);

 // 获取图片某布局
relativeLayout.setDrawingCacheEnabled(true);
relativeLayout.buildDrawingCache();

 final Bitmap bmp = relativeLayout.getDrawingCache(); // 获取图片
 savePicture(bmp, "test.jpg");// 保存图片

public void savePicture(Bitmap bm, String fileName) {
    Log.i("xing", "savePicture: ------------------------");
    if (null == bm) {
      Log.i("xing", "savePicture: ------------------图片为空------");
      return;
    }
    File foder = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + "/test");
    if (!foder.exists()) {
      foder.mkdirs();
    }
    File myCaptureFile = new File(foder, fileName);
    try {
      if (!myCaptureFile.exists()) {
        myCaptureFile.createNewFile();
      }
      BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(myCaptureFile));
      //压缩保存到本地
      bm.compress(Bitmap.CompressFormat.JPEG, 90, bos);
      bos.flush();
      bos.close();
    } catch (IOException e) {
      e.printStackTrace();
    }
    Toast.makeText(this, "保存成功!", Toast.LENGTH_SHORT).show();

  }

relativeLayout.destroyDrawingCache();

package com.adwan.savephototolocal;

import android.graphics.Bitmap;
import android.os.Environment;
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.RelativeLayout;
import android.widget.Toast;

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

public class MainActivity extends AppCompatActivity {
  private RelativeLayout relativeLayout;
  private Handler mHandler = new Handler();
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    relativeLayout = (RelativeLayout) findViewById(R.id.layout_rl);

  }

  public void save(View view) {
    initView();
  }
  private void initView() {
    // 获取图片某布局
    relativeLayout.setDrawingCacheEnabled(true);
    relativeLayout.buildDrawingCache();

    mHandler.postDelayed(new Runnable() {

      @Override
      public void run() {
        // 要在运行在子线程中
        final Bitmap bmp = relativeLayout.getDrawingCache(); // 获取图片
        savePicture(bmp, "test.jpg");// 保存图片
        relativeLayout.destroyDrawingCache(); // 保存过后释放资源
      }
    },100);
  }

  public void savePicture(Bitmap bm, String fileName) {
    Log.i("xing", "savePicture: ------------------------");
    if (null == bm) {
      Log.i("xing", "savePicture: ------------------图片为空------");
      return;
    }
    File foder = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + "/test");
    if (!foder.exists()) {
      foder.mkdirs();
    }
    File myCaptureFile = new File(foder, fileName);
    try {
      if (!myCaptureFile.exists()) {
        myCaptureFile.createNewFile();
      }
      BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(myCaptureFile));
      //压缩保存到本地
      bm.compress(Bitmap.CompressFormat.JPEG, 90, bos);
      bos.flush();
      bos.close();
    } catch (IOException e) {
      e.printStackTrace();
    }
    Toast.makeText(this, "保存成功!", Toast.LENGTH_SHORT).show();

  }

}