安卓使用getContentResolver直接获取相册图片

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使用getContentResolver直接获取相册图片

效果：

核心代码

package com.javen.devicemange.CrazyOne.content;import android.app.AlertDialog;import android.database.Cursor;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.os.Bundle;import android.provider.MediaStore;import android.support.annotation.Nullable;import android.support.v7.app.AppCompatActivity;import android.util.Log;import android.view.View;import android.widget.AdapterView;import android.widget.Button;import android.widget.ImageView;import android.widget.ListView;import android.widget.SimpleAdapter;import com.javen.devicemange.R;import java.util.ArrayList;import java.util.HashMap;/** * Created by Administrator on 2017/2/16 0016. * 使用getContentResolver直接获取相册图片 * （ContentProvider提供访问Camera所拍摄的图片） */public class MediaProviderTest extends AppCompatActivity implements View.OnClickListener {    private Button show;    private ListView listview;    @Override    protected void onCreate(@Nullable Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.mediaprovidertest);        initView();    }    private void initView() {        show = (Button) findViewById(R.id.show);        show.setOnClickListener(this);        listview = (ListView) findViewById(R.id.listview);        //        listview.setOnClickListener(this);    }    @Override    public void onClick(View v) {        switch (v.getId()) {            case R.id.show:                showMediaPhoto();                break;        }    }    ArrayList names = new ArrayList();    ArrayList descs = new ArrayList();    ArrayList<String> fileNames = new ArrayList();    ArrayList<HashMap<String, Object>> listItems = new ArrayList<>();    private void showMediaPhoto() {        names.clear();        descs.clear();        //通过ContentResolver查询所有图片信息(存储在外部存储器上的图片的Uri)        Cursor cursor = getContentResolver().query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, null, null, null, null);        while (cursor.moveToNext()) {            //获取图片的显示名            String name = cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DISPLAY_NAME));            //这里的desc为空，没有提供具体的描述信息            String desc = cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DESCRIPTION));            Log.d("GsonUtils", "desc=" + desc);            //故描述信息用文件的大小来展示            String size = cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.SIZE));            Log.d("GsonUtils", "size=" + size);            //获取图片的保存位置的数据            byte[] data = cursor.getBlob(cursor.getColumnIndex(MediaStore.Images.Media.DATA));            names.add(name);            //descs.add(desc);            //故描述信息用文件的大小来展示            descs.add(size);            //将图片的保存位置的数据转换成字符串形式的路径            String filePath = new String(data, 0, data.length - 1);            Log.d("GsonUtils", "filePath=" + filePath);            fileNames.add(filePath);        }        for (int i = 0; i < names.size(); i++) {            HashMap<String, Object> listItem = new HashMap<>();            listItem.put("name", names.get(i));            listItem.put("desc", descs.get(i));            listItems.add(listItem);        }        SimpleAdapter simpleAdapter = new SimpleAdapter(                MediaProviderTest.this,                listItems,                R.layout.list_item,                new String[]{"name", "desc"},                new int[]{R.id.name, R.id.desc}        );        listview.setAdapter(simpleAdapter);        listview.setOnItemClickListener(new AdapterView.OnItemClickListener() {            @Override            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {                Log.d("GsonUtils", "onItemClick" + position);                View viewDailog = getLayoutInflater().inflate(R.layout.dialog_item, null);                ImageView show = (ImageView) viewDailog.findViewById(R.id.show);                //获取对应条目上的指定图片                Bitmap bitmap = BitmapFactory.decodeFile(fileNames.get(position));                show.setImageBitmap(bitmap);                new AlertDialog.Builder(MediaProviderTest.this)                        .setView(viewDailog)                        .setPositiveButton("ok", null)                        .show()                ;            }        });    }}

布局xml文件

1.mediaprovidertest.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"              android:layout_width="match_parent"              android:layout_height="match_parent"              android:orientation="vertical">    <Button        android:id="@+id/show"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="show"/>    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"                  android:layout_width="wrap_content"                  android:layout_height="wrap_content"                  android:orientation="horizontal">        <TextView            android:layout_width="200dp"            android:layout_height="wrap_content"            android:text="name" android:textColor="#000"/>        <TextView            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="desc" android:textColor="#000"/>    </LinearLayout>    <ListView android:id="@+id/listview"              android:layout_width="match_parent"              android:layout_height="match_parent">    </ListView></LinearLayout>

2.list_item.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"              android:layout_width="wrap_content"              android:layout_height="wrap_content"              android:orientation="horizontal"              android:padding="10dp">    <TextView        android:id="@+id/name"        android:layout_width="200dp"        android:layout_height="wrap_content"        android:text="name" android:textColor="#000"/>   <!-- <View android:layout_width="3dp"          android:layout_height="match_parent"          android:background="#000"/>-->    <TextView        android:id="@+id/desc"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_marginLeft="10dp"        android:text="desc" android:textColor="#000"/></LinearLayout>

3.dialog_item.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" android:layout_width="match_parent"              android:layout_height="match_parent"              android:orientation="vertical">    <ImageView        android:id="@+id/show"        android:layout_width="wrap_content"        android:layout_height="wrap_content"       />    <TextView        android:id="@+id/gesture_name"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text=""    /></LinearLayout>

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