Android实现获取手机里面的所有图片

public class MainActivity extends Activity {

//查看图片按钮    private Button look;    private Button add;

//显示图片名称的list    ListView show_list;    ArrayList names = null;    ArrayList descs= null;    ArrayList fileNames = null;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        look = (Button) findViewById(R.id.look);        add = (Button) findViewById(R.id.add);        show_list = (ListView) findViewById(R.id.show_list);        look.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                names = new ArrayList();                descs = new ArrayList();                fileNames = new ArrayList();                Cursor cursor = getContentResolver().query(                        MediaStore.Images.Media.EXTERNAL_CONTENT_URI, null, null, null, null);                while (cursor.moveToNext()) {                    //获取图片的名称                    String name = cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DISPLAY_NAME));                    //获取图片的生成日期                    byte[] data = cursor.getBlob(cursor.getColumnIndex(MediaStore.Images.Media.DATA));                    //获取图片的详细信息                    String desc = cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DESCRIPTION));                    names.add(name);                    descs.add(desc);                    fileNames.add(new String(data, 0, data.length - 1));                }                List> listItems = new ArrayList<>();                for (int i = 0; i < names.size(); i++) {                    Map map = new HashMap<>();                    map.put("name", names.get(i));                    map.put("desc", descs.get(i));                    listItems.add(map);                }                //设置adapter                SimpleAdapter adapter = new SimpleAdapter(MainActivity.this, listItems,                        R.layout.line, new String[]{"name", "desc"}, new int[]{R.id.name, R.id.desc});                show_list.setAdapter(adapter);            }        });        ///list的点击事件    show_list.setOnItemClickListener(new AdapterView.OnItemClickListener() {        @Override        public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {            View viewDiag = getLayoutInflater().inflate(R.layout.view,null);            ImageView image = (ImageView)viewDiag.findViewById(R.id.image);            image.setImageBitmap(BitmapFactory.decodeFile((String) fileNames.get(i)));            new AlertDialog.Builder(MainActivity.this).setView(viewDiag)                    .setPositiveButton("确定",null).show();        }    });    }}

android:name="android.permission.READ_EXTERNAL_STORAGE"/>

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