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());            }        });    }}
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