ImageView 长按保存

效果图：


MyActivity

package com.example.AndroidTest;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.graphics.Bitmap;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Environment;
import android.text.format.DateUtils;
import android.view.View;
import android.view.WindowManager;
import android.view.inputmethod.InputMethodManager;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import org.w3c.dom.Text;

import java.io.File;
import java.io.FileOutputStream;
import java.util.Calendar;
import java.util.Date;

public class MyActivity extends Activity {
     ImageView image;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        image = (ImageView) findViewById(R.id.image_to_save);

        image.setOnLongClickListener(new View.OnLongClickListener() {
            @Override
            public boolean onLongClick(View v) {
                AlertDialog.Builder builder = new AlertDialog.Builder(MyActivity.this);
                builder.setItems(new String[]{getResources().getString(R.string.save_picture)}, new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        image.setDrawingCacheEnabled(true);
                        Bitmap imageBitmap = image.getDrawingCache();
                        if (imageBitmap != null) {
                            new SaveImageTask().execute(imageBitmap);
                        }
                    }
                });
                builder.show();

                return true;
            }
        });

    }

    private class SaveImageTask extends AsyncTask<Bitmap, Void, String> {
        @Override
        protected String doInBackground(Bitmap... params) {
            String result = getResources().getString(R.string.save_picture_failed);
            try {
                String sdcard = Environment.getExternalStorageDirectory().toString();

                File file = new File(sdcard + "/Download");
                if (!file.exists()) {
                    file.mkdirs();
                }

                File imageFile = new File(file.getAbsolutePath(),new Date().getTime()+".jpg");
                FileOutputStream outStream = null;
                outStream = new FileOutputStream(imageFile);
                Bitmap image = params[0];
                image.compress(Bitmap.CompressFormat.JPEG, 100, outStream);
                outStream.flush();
                outStream.close();
                result = getResources().getString(R.string.save_picture_success,  file.getAbsolutePath());
            } catch (Exception e) {
                e.printStackTrace();
            }
            return result;
        }

        @Override
        protected void onPostExecute(String result) {
            Toast.makeText(getApplicationContext(),result,Toast.LENGTH_SHORT).show();

            image.setDrawingCacheEnabled(false);
        }
    }

}

记得加权限：

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

布局只是一个ImageView

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

    <ImageView  android:id="@+id/image_to_save" android:layout_width="match_parent" android:layout_height="match_parent" android:src="@drawable/ic_launcher" />
</LinearLayout>

还有几个字符串

    <string name="save_picture">保存图片</string>
    <string name="save_picture_failed">保存失败</string>
    <string name="save_picture_success">图片成功保存至%s目录</string>