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Android----从相册选取图片

Android----从相册选取图片

作者: pgydbh | 来源:发表于2018-08-12 13:04 被阅读13次

    导入包名

    implementation 'com.github.bumptech.glide:glide:3.8.0'

    相册布局

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


    <RelativeLayout
        android:layout_width="match_parent"
        android:id="@+id/header"
        android:fitsSystemWindows="true"
        android:background="@color/colorPrimary"
        android:layout_height="?attr/actionBarSize">
        <TextView
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:text="选择相册"
            android:layout_alignParentBottom="true"
            android:gravity="center"
            android:textColor="@color/white"
            android:textSize="17sp"
            android:id="@+id/txt_toname"/>
        <ImageButton
            android:layout_width="50dp"
            android:layout_height="?attr/actionBarSize"
            android:scaleType="fitCenter"
            android:id="@+id/btn_back"
            android:layout_alignParentBottom="true"
            android:background="@color/transparent"
            android:src="@drawable/backer"
            android:padding="18dp"/>
    </RelativeLayout>
    <ListView
        android:layout_width="match_parent"
        android:id="@+id/lst"
        android:scrollbars="none"
        android:layout_height="match_parent">

    </ListView>

    <ViewStub
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout="@layout/loading"
        android:id="@+id/loading"/>
</LinearLayout>

    相册条目布局

    <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal" android:layout_width="match_parent"
    android:layout_height="100dp">
    <ImageView
        android:layout_width="94dp"
        android:layout_margin="3dp"
        android:layout_height="94dp"
        android:src="@mipmap/ic_launcher"
        android:scaleType="centerCrop"
        android:id="@+id/img"/>
    <TextView
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:textColor="@color/colorPrimary"
        android:layout_toRightOf="@id/img"
        android:textSize="15sp"
        android:paddingTop="15dp"
        android:paddingLeft="10dp"
        android:gravity="center_vertical"
        android:id="@+id/path"/>
    <TextView
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:textColor="@color/colorPrimary"
        android:textSize="13sp"
        android:paddingBottom="15dp"
        android:paddingLeft="10dp"
        android:layout_toRightOf="@id/img"
        android:layout_below="@id/path"
        android:gravity="center_vertical"
        android:id="@+id/size"/>
</RelativeLayout>

    图片页面

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


    <RelativeLayout
        android:layout_width="match_parent"
        android:id="@+id/header"
        android:fitsSystemWindows="true"
        android:background="@color/colorPrimary"
        android:layout_height="?attr/actionBarSize">
        <TextView
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:text="选择图片"
            android:layout_alignParentBottom="true"
            android:gravity="center"
            android:textColor="@color/white"
            android:textSize="17sp"
            android:id="@+id/txt_toname"/>
        <ImageButton
            android:layout_width="50dp"
            android:layout_height="?attr/actionBarSize"
            android:scaleType="fitCenter"
            android:id="@+id/btn_back"
            android:layout_alignParentBottom="true"
            android:background="@color/transparent"
            android:src="@drawable/backer"
            android:padding="18dp"/>
    </RelativeLayout>


    <GridView
        android:layout_width="match_parent"
        android:id="@+id/grid"
        android:numColumns="4"
        android:scrollbars="none"
        android:layout_below="@id/header"
        android:layout_height="match_parent">

    </GridView>
</RelativeLayout>

    图片条目布局

    <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal" android:layout_width="match_parent"
    android:layout_height="100dp">
    <ImageView
        android:layout_width="match_parent"
        android:layout_margin="3dp"
        android:layout_height="match_parent"
        android:src="@mipmap/ic_launcher"
        android:scaleType="centerCrop"
        android:id="@+id/img"/>
</LinearLayout>

    相册页面代码

    
public class ChooseAlbumActivity extends Activity {

    private ListView lst;
    private HashMap<String, List<String>> albums;
    private MyAdapter myAdapter;

    private ViewStub loading;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.mine_choose_album);

        loading = findViewById(R.id.loading);
        lst = findViewById(R.id.lst);
        lst.setAdapter(myAdapter = new MyAdapter());

        lst.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                Intent intent = new Intent(ChooseAlbumActivity.this, ChoosePhotoActivity.class);
                intent.putExtra("photos", (Serializable) albums.get(albums.keySet().toArray()[position]));
                intent.putExtra("sign", getIntent().getIntExtra("sign", -1));
                startActivity(intent);
            }
        });

        findViewById(R.id.btn_back).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                finish();
            }
        });
    }


    private class MyAdapter extends BaseAdapter {
        @Override
        public int getCount() {
            if (albums == null)
                return 0;
            return albums.size();
        }

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

        @Override
        public long getItemId(int position) {
            return position;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            ViewHolder viewHolder = null;
            if (convertView == null){
                convertView = LayoutInflater.from(ChooseAlbumActivity.this).inflate(R.layout.own_album_item, null, false);
                viewHolder = new ViewHolder();
                viewHolder.path = convertView.findViewById(R.id.path);
                viewHolder.img = convertView.findViewById(R.id.img);
                viewHolder.size = convertView.findViewById(R.id.size);
                convertView.setTag(viewHolder);
            }
            else
                viewHolder = (ViewHolder) convertView.getTag();

            viewHolder.size.setText("此相册共有：" + albums.get(albums.keySet().toArray()[position]).size() + "张");
            viewHolder.path.setText(((String)albums.keySet().toArray()[position]).replace(Environment.getExternalStorageDirectory().getPath() + "/", ""));
            MyImgShow.showLocalImgSquare(ChooseAlbumActivity.this, "file://" + albums.get(albums.keySet().toArray()[position]).get(0), viewHolder.img);
            return convertView;
        }

        public class ViewHolder {
            TextView path;
            ImageView img;
            TextView size;
        }
    }


    @Override
    protected void onResume() {
        super.onResume();
        new WeakTask<Integer>(new MyWeakTaskListener()).execute();
    }

    private HashMap<String, List<String>> getSystemPhotoList()
    {
        HashMap<String, List<String>> temps = new HashMap<String, List<String>>();

        Uri uri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;

        ContentResolver contentResolver = this.getContentResolver();
        Cursor cursor = contentResolver.query(uri, null, null, null, null);
        if (cursor == null || cursor.getCount() <= 0)
            return temps; // 没有图片
        while (cursor.moveToNext())
        {
            int index = cursor
                    .getColumnIndexOrThrow(MediaStore.Images.Media.DATA);

            String path = cursor.getString(index); // 文件地址
            File file = new File(path);
            if (file.exists())
            {
                String fatherPath = path.substring(0, path.lastIndexOf('/'));
                if (temps.get(fatherPath) == null){
                    temps.put(fatherPath, new ArrayList<String>());
                }
                temps.get(fatherPath).add(path);
            }
        }

        Object[] keys = temps.keySet().toArray();
        for (int i = 0; i < keys.length; i++){
            Collections.reverse(temps.get(keys[i]));
        }
        return temps;
    }


    private class MyWeakTaskListener implements OnWeakTaskListener<Integer>{

        @Override
        public void before() {
            loading.setVisibility(View.VISIBLE);
        }

        @Override
        public Integer middle() {
            albums = getSystemPhotoList();
            return 2;
        }


        @Override
        public void after(Integer integer) {
            loading.setVisibility(View.GONE);
            myAdapter.notifyDataSetChanged();
        }

    }
}

    图片页面代码

    

public class ChoosePhotoActivity extends Activity {

    private GridView grid;

    private List<String> photos;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.mine_choose_photo);

        grid = findViewById(R.id.grid);


        photos = (List<String>) getIntent().getSerializableExtra("photos");

        grid.setAdapter(new MyAdapter());

        grid.setOnItemClickListener(new AdapterView.OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                //在这里添加事件
                Intent intent = new Intent(ChoosePhotoActivity.this, ChooseResultActivity.class);
                startActivity(intent.putExtra("path", photos.get(position)));
            }
        });

        findViewById(R.id.btn_back).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                finish();
            }
        });
    }

    private class MyAdapter extends BaseAdapter {
        @Override
        public int getCount() {
            if (photos == null)
                return 0;
            return photos.size();
        }

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

        @Override
        public long getItemId(int position) {
            return position;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            ViewHolder viewHolder = null;
            if (convertView == null) {
                convertView = LayoutInflater.from(ChoosePhotoActivity.this).inflate(R.layout.own_photo_item, grid, false);
                viewHolder = new ViewHolder();
                viewHolder.img = convertView.findViewById(R.id.img);
                convertView.setTag(viewHolder);
            } else
                viewHolder = (ViewHolder) convertView.getTag();

            MyImgShow.showLocalImgSquare(ChoosePhotoActivity.this, "file://" + photos.get(position), viewHolder.img);
            return convertView;
        }

        public class ViewHolder {
            ImageView img;
        }
    }
}

    辅助类

    MyImageShow
    public class MyImgShow {
    public static void showLocalImgSquare(Context context, String url, ImageView img){
        Glide.with(context)
                .load(url)
                .asBitmap()
                .error(R.drawable.error)
                .placeholder(R.drawable.placehoder)
                .dontAnimate()
                .override(200, 200)
                .diskCacheStrategy(DiskCacheStrategy.RESULT)
                .fitCenter()
                .into(img);
    }
}
    WeakTask
    https://www.jianshu.com/p/4bfabe07b23a

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