安卓：图像保存到的位置 [英] Android: Image save to location

问题描述

我正在上显示一组图像，那么如果用户希望，有将图像保存到SD卡的能力。我需要帮助他们保存到外部存储。有人可以帮助我吗？

网格视图：

 公共无效的onCreate（包savedInstanceState）{
super.onCreate（savedInstanceState）;
的setContentView（R.layout.main）;

GridView控件的GridView =（GridView控件）findViewById（R.id.gridview）;
gridview.setAdapter（新ImageAdapter（本））;

gridview.setOnItemClickListener（新OnItemClickListener（）{
    公共无效onItemClick（适配器视图＆LT;＆GT;母公司，视图V，INT位置，长的id）{
        Toast.makeText（HelloGridView.this，+位置，Toast.LENGTH_SHORT）.show（）;
    }
}）;
 

ImageAdapter：

 公共类ImageAdapter扩展了BaseAdapter {
私人语境mContext;

公共ImageAdapter（上下文C）{
    mContext = C;
}

公众诠释getCount将（）{
    返回mThumbIds.length;
}

公共对象的getItem（INT位置）{
    返回null;
}

众长getItemId（INT位置）{
    返回0;
}

//创建由适配器引用的每个项目的新的ImageView
公共查看getView（INT位置，查看convertView，ViewGroup中父）{
    ImageView的ImageView的;
    如果（convertView == NULL）{//如果它不回收，初始化一些属性
        ImageView的=新ImageView的（mContext）;
        imageView.setLayoutParams（新GridView.LayoutParams（85，85））;
        imageView.setScaleType（ImageView.ScaleType.CENTER_CROP）;
        imageView.setPadding（8,8，8,8）;
    } 其他 {
        ImageView的=（ImageView的）convertView;
    }

    imageView.setImageResource（mThumbIds [位置]）;
    返回ImageView的;
}

//引用到我们的形象
私人整数[] mThumbIds = {
        R.drawable.sample_2，R.drawable.sample_3，
        R.drawable.sample_4，R.drawable.sample_5，
        R.drawable.sample_6，R.drawable.sample_7，
        R.drawable.sample_0，R.drawable.sample_1，
        R.drawable.sample_2，R.drawable.sample_3，
        R.drawable.sample_4，R.drawable.sample_5，
        R.drawable.sample_6，R.drawable.sample_7，
        R.drawable.sample_0，R.drawable.sample_1，
        R.drawable.sample_2，R.drawable.sample_3，
        R.drawable.sample_4，R.drawable.sample_5，
        R.drawable.sample_6，R.drawable.sample_7
};
 

解决方案

喜 我没有用过code我给你作为应用程序的一部分，但我没有使用这个在运行时在我的应用程序之一生成的调试位图。

 尝试{
           FileOutputStream中出=新的FileOutputStream（/ SD卡/ test2.png）;
           mBitmap.com preSS（Bitmap.Com pressFormat.PNG，90，出）;
        }赶上（例外五）{
           e.printStackTrace（）;
        }
 

本code，只要你有一个位图，你只需要这个+清单的权限

 ＆LT;使用-权限的Andr​​oid：名称=android.permission.WRITE_EXTERNAL_STORAG​​E/＆GT;
 

。希望做的伎俩为您

杰森

I'm working on displaying a set of images, then if the users wishes, to have the ability to save the image to the SD card. I need help saving them to external storage. Can someone help me out with this?

Grid View:

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

GridView gridview = (GridView) findViewById(R.id.gridview);
gridview.setAdapter(new ImageAdapter(this));

gridview.setOnItemClickListener(new OnItemClickListener() {
    public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
        Toast.makeText(HelloGridView.this, "" + position, Toast.LENGTH_SHORT).show();
    }
});

ImageAdapter:

public class ImageAdapter extends BaseAdapter {
private Context mContext;

public ImageAdapter(Context c) {
    mContext = c;
}

public int getCount() {
    return mThumbIds.length;
}

public Object getItem(int position) {
    return null;
}

public long getItemId(int position) {
    return 0;
}

// create a new ImageView for each item referenced by the Adapter
public View getView(int position, View convertView, ViewGroup parent) {
    ImageView imageView;
    if (convertView == null) {  // if it's not recycled, initialize some attributes
        imageView = new ImageView(mContext);
        imageView.setLayoutParams(new GridView.LayoutParams(85, 85));
        imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
        imageView.setPadding(8, 8, 8, 8);
    } else {
        imageView = (ImageView) convertView;
    }

    imageView.setImageResource(mThumbIds[position]);
    return imageView;
}

// references to our images
private Integer[] mThumbIds = {
        R.drawable.sample_2, R.drawable.sample_3,
        R.drawable.sample_4, R.drawable.sample_5,
        R.drawable.sample_6, R.drawable.sample_7,
        R.drawable.sample_0, R.drawable.sample_1,
        R.drawable.sample_2, R.drawable.sample_3,
        R.drawable.sample_4, R.drawable.sample_5,
        R.drawable.sample_6, R.drawable.sample_7,
        R.drawable.sample_0, R.drawable.sample_1,
        R.drawable.sample_2, R.drawable.sample_3,
        R.drawable.sample_4, R.drawable.sample_5,
        R.drawable.sample_6, R.drawable.sample_7
};

解决方案

Hi I haven't used the code I'm giving you as part of an application but I did use this to debug bitmaps generated at runtime in one of my apps.

try {
           FileOutputStream out = new FileOutputStream("/sdcard/test2.png");
           mBitmap.compress(Bitmap.CompressFormat.PNG, 90, out);
        } catch (Exception e) {
           e.printStackTrace();
        }

with this code as long as you have a bitmap, you just need this + the manifest permission

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

Hope that does the trick for you

Jason

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