本文实例为大家分享了Android实现选择相册图片并显示的具体代码,供大家参考,具体内容如下
需求描述: 选择手机相册中的一张图片,并通过ImageView展示出来
参考博文: android打开手机相册获取真正的图片路径
效果展示:
示例代码:
MainActivity
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package com.example.www.mutilmedia; import android.Manifest; import android.app.Activity; import android.content.Intent; import android.content.pm.PackageManager; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.os.Build; import android.os.Bundle; import android.support.annotation.NonNull; import android.support.v4.app.ActivityCompat; import android.support.v7.app.AppCompatActivity; import android.util.Log; import android.view.View; import android.widget.ImageView; import android.widget.Toast; import java.util.Arrays; public class MainActivity extends AppCompatActivity { String[] mPermissionList = new String[]{ Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.READ_EXTERNAL_STORAGE}; public static final int REQUEST_PICK_IMAGE = 11101 ; private ImageView mShowImg; @Override protected void onCreate(Bundle savedInstanceState) { super .onCreate(savedInstanceState); setContentView(R.layout.activity_main); mShowImg = (ImageView) findViewById(R.id.imageView); } @Override public void onRequestPermissionsResult( int requestCode, @NonNull String[] permissions, @NonNull int [] grantResults) { super .onRequestPermissionsResult(requestCode, permissions, grantResults); switch (requestCode) { case 100 : boolean writeExternalStorage = grantResults[ 0 ] == PackageManager.PERMISSION_GRANTED; boolean readExternalStorage = grantResults[ 1 ] == PackageManager.PERMISSION_GRANTED; Log.e( "MainActivity" , Arrays.toString(grantResults)); if (grantResults.length > 0 && writeExternalStorage && readExternalStorage) { getImage(); } else { Toast.makeText( this , "请设置必要权限" , Toast.LENGTH_SHORT).show(); } break ; } } private void getImage() { if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) { startActivityForResult( new Intent(Intent.ACTION_GET_CONTENT).setType( "image/*" ), REQUEST_PICK_IMAGE); } else { Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT); intent.addCategory(Intent.CATEGORY_OPENABLE); intent.setType( "image/*" ); startActivityForResult(intent, REQUEST_PICK_IMAGE); } } @Override protected void onActivityResult( int requestCode, int resultCode, Intent data) { super .onActivityResult(requestCode, resultCode, data); if (resultCode == Activity.RESULT_OK) { switch (requestCode) { case REQUEST_PICK_IMAGE: if (data != null ) { String realPathFromUri = RealPathFromUriUtils.getRealPathFromUri( this , data.getData()); Log.e( "MainActivity" , realPathFromUri); showImg(realPathFromUri); } else { Toast.makeText( this , "图片损坏,请重新选择" , Toast.LENGTH_SHORT).show(); } break ; } } } public void openCamera(View view) { ActivityCompat.requestPermissions(MainActivity. this , mPermissionList, 100 ); } public void showImg(String path){ Bitmap bitmap = BitmapFactory.decodeFile(path); mShowImg.setImageBitmap(bitmap); } } |
RealPathFromUriUtils
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package com.example.www.mutilmedia; import android.annotation.SuppressLint; import android.content.ContentUris; import android.content.Context; import android.database.Cursor; import android.net.Uri; import android.os.Build; import android.provider.DocumentsContract; import android.provider.MediaStore; public class RealPathFromUriUtils { /** * 根据Uri获取图片的绝对路径 * * @param context 上下文对象 * @param uri 图片的Uri * @return 如果Uri对应的图片存在, 那么返回该图片的绝对路径, 否则返回null */ public static String getRealPathFromUri(Context context, Uri uri) { int sdkVersion = Build.VERSION.SDK_INT; if (sdkVersion >= 19 ) { // api >= 19 return getRealPathFromUriAboveApi19(context, uri); } else { // api < 19 return getRealPathFromUriBelowAPI19(context, uri); } } /** * 适配api19以下(不包括api19),根据uri获取图片的绝对路径 * * @param context 上下文对象 * @param uri 图片的Uri * @return 如果Uri对应的图片存在, 那么返回该图片的绝对路径, 否则返回null */ private static String getRealPathFromUriBelowAPI19(Context context, Uri uri) { return getDataColumn(context, uri, null , null ); } /** * 适配api19及以上,根据uri获取图片的绝对路径 * * @param context 上下文对象 * @param uri 图片的Uri * @return 如果Uri对应的图片存在, 那么返回该图片的绝对路径, 否则返回null */ @SuppressLint ( "NewApi" ) private static String getRealPathFromUriAboveApi19(Context context, Uri uri) { String filePath = null ; if (DocumentsContract.isDocumentUri(context, uri)) { // 如果是document类型的 uri, 则通过document id来进行处理 String documentId = DocumentsContract.getDocumentId(uri); if (isMediaDocument(uri)) { // MediaProvider // 使用':'分割 String id = documentId.split( ":" )[ 1 ]; String selection = MediaStore.Images.Media._ID + "=?" ; String[] selectionArgs = {id}; filePath = getDataColumn(context, MediaStore.Images.Media.EXTERNAL_CONTENT_URI, selection, selectionArgs); } else if (isDownloadsDocument(uri)) { // DownloadsProvider Uri contentUri = ContentUris.withAppendedId(Uri.parse( "content://downloads/public_downloads" ), Long.valueOf(documentId)); filePath = getDataColumn(context, contentUri, null , null ); } } else if ( "content" .equalsIgnoreCase(uri.getScheme())) { // 如果是 content 类型的 Uri filePath = getDataColumn(context, uri, null , null ); } else if ( "file" .equals(uri.getScheme())) { // 如果是 file 类型的 Uri,直接获取图片对应的路径 filePath = uri.getPath(); } return filePath; } /** * 获取数据库表中的 _data 列,即返回Uri对应的文件路径 * * @return */ private static String getDataColumn(Context context, Uri uri, String selection, String[] selectionArgs) { String path = null ; String[] projection = new String[]{MediaStore.Images.Media.DATA}; Cursor cursor = null ; try { cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs, null ); if (cursor != null && cursor.moveToFirst()) { int columnIndex = cursor.getColumnIndexOrThrow(projection[ 0 ]); path = cursor.getString(columnIndex); } } catch (Exception e) { if (cursor != null ) { cursor.close(); } } return path; } /** * @param uri the Uri to check * @return Whether the Uri authority is MediaProvider */ private static boolean isMediaDocument(Uri uri) { return "com.android.providers.media.documents" .equals(uri.getAuthority()); } /** * @param uri the Uri to check * @return Whether the Uri authority is DownloadsProvider */ private static boolean isDownloadsDocument(Uri uri) { return "com.android.providers.downloads.documents" .equals(uri.getAuthority()); } } |
activity_main.xml
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<? xml version = "1.0" encoding = "utf-8" ?> < android.support.constraint.ConstraintLayout 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 = ".MainActivity" > < ImageView android:id = "@+id/imageView" android:layout_width = "0dp" android:layout_height = "0dp" android:layout_marginStart = "8dp" android:layout_marginTop = "8dp" android:layout_marginEnd = "8dp" android:layout_marginBottom = "8dp" app:layout_constraintBottom_toBottomOf = "parent" app:layout_constraintEnd_toEndOf = "parent" app:layout_constraintStart_toStartOf = "parent" app:layout_constraintTop_toBottomOf = "@+id/button3" app:srcCompat = "@android:color/white" /> < Button android:id = "@+id/button3" android:layout_width = "wrap_content" android:layout_height = "wrap_content" android:layout_marginStart = "8dp" android:layout_marginTop = "16dp" android:layout_marginEnd = "8dp" android:onClick = "openCamera" android:text = "camera" app:layout_constraintEnd_toEndOf = "parent" app:layout_constraintHorizontal_bias = "0.048" app:layout_constraintStart_toStartOf = "parent" app:layout_constraintTop_toTopOf = "parent" /> </ android.support.constraint.ConstraintLayout > |
AndroidManifest.xml
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<? xml version = "1.0" encoding = "utf-8" ?> < manifest xmlns:android = "http://schemas.android.com/apk/res/android" package = "com.example.www.mutilmedia" > < uses-permission android:name = "android.permission.READ_EXTERNAL_STORAGE" /> < uses-permission android:name = "android.permission.WRITE_EXTERNAL_STORAGE" /> < application android:allowBackup = "true" android:icon = "@mipmap/ic_launcher" android:label = "@string/app_name" android:roundIcon = "@mipmap/ic_launcher_round" android:supportsRtl = "true" android:theme = "@style/AppTheme" > < activity android:name = ".MainActivity" > < intent-filter > < action android:name = "android.intent.action.MAIN" /> < category android:name = "android.intent.category.LAUNCHER" /> </ intent-filter > </ activity > </ application > </ manifest > |
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:https://blog.csdn.net/ITzhongzi/article/details/88974564