Android 读取手机音乐，视频，图片

Android 通过 content provider（内容提供者）获取手机媒体存储。

直接上代码：

1：配置权限：
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

2：获取并显示基本信息：

public class MainActivity extends AppCompatActivity {

    private Button button1,button2,button3;
    private TextView  textView1;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        button1 = (Button)findViewById(R.id.getImg);
        button2 = (Button)findViewById(R.id.getMusic);
        button3 = (Button)findViewById(R.id.getVideo);
        textView1 = (TextView)findViewById(R.id.show);

        //获取图片
        button1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Uri uri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
                String[] str = {
                        MediaStore.Images.Media._ID,//图片id
                        MediaStore.Images.Media.DISPLAY_NAME,//图片名称
                        MediaStore.Images.Media.DATA//图片路径
                };
                //获取返回的结果集
                Cursor cursor = getContentResolver().query(uri,str,null,null,null);
                StringBuffer stringBuffer = new StringBuffer();
                //读取结果集
                while (cursor.moveToNext()){
                    stringBuffer.append(cursor.getString(0)+"\n");
                    stringBuffer.append(cursor.getString(1)+"\n");
                    stringBuffer.append(cursor.getString(2)+"\n");
                }
                cursor.close();
                textView1.setText(stringBuffer.toString());
            }
        });

    //音乐
        button2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Uri uri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
                String[] str = {
                        MediaStore.Audio.Media._ID,
                        MediaStore.Audio.Media.ALBUM,//专辑
                        MediaStore.Audio.Media.ARTIST,//作者
                        MediaStore.Audio.Media.DATA
                };
                Cursor cursor = getContentResolver().query(uri,str,null,null,null);
                StringBuffer stringBuffer = new StringBuffer();
                while (cursor.moveToNext()){
                    stringBuffer.append(cursor.getString(0)+"\n");
                    stringBuffer.append(cursor.getString(1)+"\n");
                    stringBuffer.append(cursor.getString(2)+"\n");
                    stringBuffer.append(cursor.getString(3)+"\n");
                }
                cursor.close();
                textView1.setText(stringBuffer.toString());
            }
        });

    //视频
        button3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Uri uri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
                String[] str = {
                        MediaStore.Video.Media._ID,
                        MediaStore.Video.Media.DISPLAY_NAME,
                        MediaStore.Video.Media.DATA
                };
                Cursor cursor = getContentResolver().query(uri,str,null,null,null);
                StringBuffer stringBuffer = new StringBuffer();
                while (cursor.moveToNext()){
                    stringBuffer.append(cursor.getString(0)+"\n");
                    stringBuffer.append(cursor.getString(1)+"\n");
                    stringBuffer.append(cursor.getString(2)+"\n");
                }
                cursor.close();
                textView1.setText(stringBuffer.toString());
            }
        });
    }


}