獲取sd卡中的圖片URL並顯示,同時使用ImageView把選擇的圖片展現出來
阿新 • • 發佈:2019-02-12
配置檔案get_picture_url.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <Button android:id="@+id/select" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="請選擇SD卡中的圖片" /> <TextView android:id="@+id/textView1" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="Medium Text" android:textAppearance="?android:attr/textAppearanceMedium" /> <ImageView android:id="@+id/imageView1" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_weight="1" android:src="@drawable/ic_launcher" /> </LinearLayout>
java檔案GetPictureUrl.java
package com.example.zgetpictureurl; import java.io.IOException; import android.app.Activity; import android.content.ContentResolver; import android.content.Intent; import android.database.Cursor; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.net.Uri; import android.os.Bundle; import android.provider.MediaStore; import android.util.Log; import android.view.View; import android.widget.Button; import android.widget.ImageView; import android.widget.TextView; public class GetPictureUrl extends Activity { private Button select; private TextView showURL; private ImageView showPicture; private final String IMAGE_TYPE = "image/*"; private final int IMAGE_CODE = 0; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.get_picture_url); select = (Button)findViewById(R.id.select); select.setOnClickListener(new View.OnClickListener(){ public void onClick(View v) { Intent getAlbum = new Intent(Intent.ACTION_GET_CONTENT); getAlbum.setType(IMAGE_TYPE); startActivityForResult(getAlbum, IMAGE_CODE); } }); } protected void onActivityResult(int requestCode, int resultCode, Intent data){ if (resultCode != RESULT_OK) { //此處的 RESULT_OK 是系統自定義得一個常量 //Log.e(TAG,"ActivityResult resultCode error"); return; } Bitmap bm = null; ContentResolver resolver = getContentResolver(); if (requestCode == IMAGE_CODE) { try { //獲得圖片的uri Uri originalUri = data.getData(); //顯得到bitmap圖片 bm = MediaStore.Images.Media.getBitmap(resolver, originalUri); //這裡開始的第二部分,獲取圖片的路徑: String[] proj = {MediaStore.Images.Media.DATA}; Cursor cursor = managedQuery(originalUri, proj, null, null, null); //按我個人理解 這個是獲得使用者選擇的圖片的索引值 int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA); cursor.moveToFirst(); //最後根據索引值獲取圖片路徑 String path = cursor.getString(column_index); Log.e("Lostinai",path); //通過TextView來展示sd卡中圖片的url,以方便寫進資料庫 showURL = (TextView)findViewById(R.id.textView1); showURL.setText(path); //通過ImageView來展示圖片的內容 showPicture = (ImageView)findViewById(R.id.imageView1); Bitmap bit = BitmapFactory.decodeFile(path); showPicture.setImageBitmap(bit); }catch (IOException e) { Log.e("Lostinai",e.toString()); } } } }
AndroidManifest.xml中新增程式碼
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
其中Medium Text就是用來顯示sd卡中圖片的URL的