Android——ContentProvide 内容提供者+四大组件之三

Android提供的用于不同应用共享数据API

Android系统提供的 ContentProvide  

1Applications 提供已安装应用程序信息

Browser  浏览器

CallLog   储存通话记录
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[java] view
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package c.example.jreduch09.contentprovider;  

  

import android.database.Cursor;  

import android.os.Bundle;  

import android.provider.MediaStore;  

import android.support.v7.app.AppCompatActivity;  

import android.view.View;  

import android.widget.Button;  

import android.widget.TextView;  

  

import c.example.jreduch09.R;  

  

public class ContentActivity extends AppCompatActivity {  

private Button img,mp3,mp4;  

    private TextView show;  

    @Override  

    protected void onCreate(Bundle savedInstanceState) {  

        super.onCreate(savedInstanceState);  

        setContentView(R.layout.activity_content);  

        img=(Button)findViewById(R.id.img);  

        mp3=(Button)findViewById(R.id.mp3);  

        mp4=(Button)findViewById(R.id.mp4);  

        show=(TextView)findViewById(R.id.show);  

        img.setOnClickListener(new MyListener());  

        mp3.setOnClickListener(new MyListener());  

        mp4.setOnClickListener(new MyListener());  

    }  

  

    public  class  MyListener implements View.OnClickListener{  

        @Override  

        public void onClick(View view) {  

            int id=view.getId();  

            if (id==R.id.img){  

                String str[]={MediaStore.Images.Media._ID,  

                MediaStore.Images.Media.DISPLAY_NAME,  

                MediaStore.Images.Media.DATA,  

             };  

                Cursor cursor=getContentResolver().query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,  

                        str,null,null,null);  

                StringBuilder sbd=new StringBuilder();  

                while (cursor.moveToNext()){  

                    sbd.append(cursor.getString(0)+":");  

                    sbd.append(cursor.getString(1)+":");  

                    sbd.append(cursor.getString(2)+"\n");  

                }  

                show.setText(sbd.toString());  

            }else   if (id==R.id.mp3){  

                String str[]={MediaStore.Audio.Media._ID,  

                        MediaStore.Audio.Media.DISPLAY_NAME,//歌名  

                        MediaStore.Audio.Media.DATA,         //路径  

                        MediaStore.Audio.Media.SIZE,          //  

                        MediaStore.Audio.Media.ARTIST,  //歌手  

                        MediaStore.Audio.Media.DURATION,  //时长  

                        MediaStore.Audio.Media.ALBUM,  //专辑  

  

                };  

  

       Cursor cursor=getContentResolver().query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,  

                 str,"duration>?",  

               new String[]{"50000"},null );  

                StringBuilder sbd=new StringBuilder();  

                while (cursor.moveToNext()){  

                    sbd.append(cursor.getString(0)+":");  

                    sbd.append(cursor.getString(1)+":");  

                    sbd.append(cursor.getString(2)+":");  

                    sbd.append(cursor.getString(3)+":");  

                    sbd.append(cursor.getString(4)+":");  

                    sbd.append(cursor.getString(5)+":");  

                    sbd.append(cursor.getString(6)+"\n");  

                }  

                show.setText(sbd.toString());  

            }else   if (id==R.id.mp4){  

                String str[]={MediaStore.Video.Media._ID,  

                        MediaStore.Video.Media.DISPLAY_NAME,  

                        MediaStore.Video.Media.DATA,  

                        MediaStore.Video.Media.SIZE  

                };  

  

                Cursor cursor=getContentResolver().query(MediaStore.Video.Media.EXTERNAL_CONTENT_URI,  

                        str,null,null,null );  

                StringBuilder sbd=new StringBuilder();  

                while (cursor.moveToNext()){  

                    sbd.append(cursor.getString(0)+":");  

                    sbd.append(cursor.getString(1)+":");  

                    sbd.append(cursor.getString(2)+":");  

                    sbd.append(cursor.getString(3)+"\n");  

                }  

                show.setText(sbd.toString());  

  

            }  

        }  

    }  

  

}  

[html] view
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<?xml version="1.0" encoding="utf-8"?>  

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  

    xmlns:tools="http://schemas.android.com/tools"  

    android:layout_width="match_parent"  

    android:layout_height="match_parent"  

  

    tools:context="c.example.jreduch09.contentprovider.ContentActivity">  

<LinearLayout  

    android:layout_width="match_parent"  

    android:layout_height="match_parent"  

    android:orientation="vertical"  

    >  

  

    <Button  

        android:layout_width="match_parent"  

        android:layout_height="50dp"  

        android:id="@+id/img"  

        android:text="扫描图库"  

        android:textSize="25sp"  

        />  

    <Button  

        android:layout_width="match_parent"  

        android:layout_height="50dp"  

        android:id="@+id/mp3"  

        android:text="扫描音频"  

        android:textSize="25sp"  

        />  

    <Button  

        android:layout_width="match_parent"  

        android:layout_height="50dp"  

        android:id="@+id/mp4"  

        android:text="扫描视频"  

        android:textSize="25sp"  

        />  

    <ScrollView  

        android:layout_width="match_parent"  

        android:layout_height="match_parent">  

  

        <TextView  

            android:layout_width="match_parent"  

            android:layout_height="match_parent"  

            android:id="@+id/show"  

            />  

    </ScrollView>  

</LinearLayout>  

  

</RelativeLayout>