Android ContentProvider管理多媒体内容_content providers create digital text, video, audi

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

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="shortcut.song.com.myapplication.ContactMedia">

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="view-media"
        android:onClick="viewMedia"/>
 <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="ADD-MEDIA"
        android:onClick="addMedia"/>
    <ListView
        android:id="@+id/show_media"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>
</LinearLayout>
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contact_media_view.xml

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

    <ImageView
        android:id="@+id/image_contact_media"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
</LinearLayout>
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ContactMedia.java

package shortcut.song.com.myapplication;

import android.database.Cursor;
import android.graphics.BitmapFactory;
import android.provider.ContactsContract;
import android.provider.MediaStore;
import android.provider.MediaStore.Images.Media;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.SimpleAdapter;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class ContactMedia extends AppCompatActivity {

    ListView show;
    ArrayList<String> names = new ArrayList<String>();
    ArrayList<String> descs = new ArrayList<String>();
    ArrayList<String> fileNames = new ArrayList<String>();


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_contact_media);
        show = (ListView)findViewById(R.id.show_media);


        show.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                View viewDialog = getLayoutInflater().inflate(R.layout.contact_media_view,null);
                ImageView image = (ImageView)viewDialog.findViewById(R.id.image_contact_media);

                image.setImageBitmap(BitmapFactory.decodeFile(fileNames.get(position)));

                new AlertDialog.Builder(ContactMedia.this)
                    .setView(viewDialog)
                    .setPositiveButton("Ok", null)
                    .show();
            }
        });
    }

    public void viewMedia(View v) {
        names.clear();
        descs.clear();
        fileNames.clear();
        //通过ContentResolver查询所有图片信息
        Cursor cursor = getContentResolver().query(Media.EXTERNAL_CONTENT_URI, null, null, null,null);
        while (cursor.moveToNext()) {
            // 获取图片的显示名字
            String name = cursor.getString(cursor.getColumnIndex(Media.DISPLAY_NAME));

            // 获取图片的详细描述
            String desc = cursor.getString(cursor.getColumnIndex(Media.DESCRIPTION));

            // 获取图片的保存位置的数据
            byte[] data = cursor.getBlob(cursor.getColumnIndex(Media.DATA));
            names.add(name);
            descs.add(desc);
            fileNames.add(new String(data, 0, data.length - 1));
        }

        List<Map<String, Object>> listItems = new ArrayList<>();

        for (int i = 0; i < names.size(); i++) {
            Map<String, Object> listItem = new HashMap<>();
            listItem.put("name", names.get(i));
            listItem.put("desc", descs.get(i));
            listItems.add(listItem);
        }

        SimpleAdapter simpleAdapter = new SimpleAdapter(
                ContactMedia.this,listItems
                ,R.layout.contactmedia_line, new String[]{"name", "desc"}
                ,new int[]{R.id.name, R.id.desc});

            show.setAdapter(simpleAdapter);


    }

public void addMedia(View v) {
        ContentValues values = new ContentValues();
        values.put(Media.DISPLAY_NAME, "qiao");
        values.put(Media.DESCRIPTION, "大桥");
        values.put(Media.MIME_TYPE, "image/jpeg");

        //插入数据，返回所插入数据对应的URI
        Uri uri = getContentResolver().insert(Media.EXTERNAL_CONTENT_URI, values);
        // 加载应用程序下的qiao图片
        Bitmap bitmap = BitmapFactory.decodeResource(ContactMedia.this.getResources(), R.drawable.qiao);
        OutputStream os = null;
        try {
            // 获取刚插入的数据的Uri对应的输出流
            os = getContentResolver().openOutputStream(uri);
            //将bitmap图片保存到Uri对应的数据节点
            bitmap.compress(Bitmap.CompressFormat.JPEG, 100, os);
            os.close();
        }catch (IOException e) {
            e.printStackTrace();
        }
    }

}
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运行效果：