Android实现屏幕截图并保存截图到指定文件

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

package zhangphil.test;
 
import android.app.activity;
import android.content.context;
import android.content.res.resources;
import android.graphics.bitmap;
import android.os.bundle;
import android.os.environment;
import android.support.annotation.nullable;
import android.support.v7.app.appcompatactivity;
import android.util.displaymetrics;
import android.view.view;
import android.widget.toast;
 
import java.io.bufferedoutputstream;
import java.io.file;
import java.io.fileoutputstream;
import java.io.ioexception;
import java.io.outputstream;
 
public class javaactivity extends appcompatactivity {
 
  @override
  protected void oncreate(@nullable bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.drawable_activity);
 
    appcompatactivity activity = this;
 
    findviewbyid(r.id.button).setonclicklistener(new view.onclicklistener() {
      @override
      public void onclick(view v) {
        file file = new file(environment.getexternalstoragepublicdirectory(environment.directory_pictures), "zhangphil.jpg");
        bitmap bitmap = screenshot(activity);
        try {
          if (!file.exists())
            file.createnewfile();
 
          boolean ret = save(bitmap, file, bitmap.compressformat.jpeg, true);
          if (ret) {
            toast.maketext(getapplicationcontext(), "截图已保持至 " + file.getabsolutepath(), toast.length_short).show();
          }
        } catch (exception e) {
          e.printstacktrace();
        }
      }
    });
  }
 
  /**
   * 保存图片到文件file。
   *
   * @param src   源图片
   * @param file  要保存到的文件
   * @param format 格式
   * @param recycle 是否回收
   * @return true 成功 false 失败
   */
  public static boolean save(bitmap src, file file, bitmap.compressformat format, boolean recycle) {
    if (isemptybitmap(src))
      return false;
 
    outputstream os;
    boolean ret = false;
    try {
      os = new bufferedoutputstream(new fileoutputstream(file));
      ret = src.compress(format, 100, os);
      if (recycle && !src.isrecycled())
        src.recycle();
    } catch (ioexception e) {
      e.printstacktrace();
    }
 
    return ret;
  }
 
 
  /**
   * 获取当前屏幕截图，不包含状态栏（status bar）。
   *
   * @param activity activity
   * @return bitmap
   */
  public static bitmap screenshot(activity activity) {
    view view = activity.getwindow().getdecorview();
    view.setdrawingcacheenabled(true);
    view.builddrawingcache();
    bitmap bmp = view.getdrawingcache();
    int statusbarheight = getstatusbarheight(activity);
    int width = (int) getdevicedisplaysize(activity)[0];
    int height = (int) getdevicedisplaysize(activity)[1];
 
    bitmap ret = bitmap.createbitmap(bmp, 0, statusbarheight, width, height - statusbarheight);
    view.destroydrawingcache();
 
    return ret;
  }
 
  public static float[] getdevicedisplaysize(context context) {
    resources resources = context.getresources();
    displaymetrics dm = resources.getdisplaymetrics();
    int width = dm.widthpixels;
    int height = dm.heightpixels;
 
    float[] size = new float[2];
    size[0] = width;
    size[1] = height;
 
    return size;
  }
 
  public static int getstatusbarheight(context context) {
    int height = 0;
    int resourceid = context.getresources().getidentifier("status_bar_height", "dimen", "android");
    if (resourceid > 0) {
      height = context.getresources().getdimensionpixelsize(resourceid);
    }
 
    return height;
  }
 
  /**
   * bitmap对象是否为空。
   */
  public static boolean isemptybitmap(bitmap src) {
    return src == null || src.getwidth() == 0 || src.getheight() == 0;
  }
}