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本帖最后由 alltolove 于 2017-10-29 09:10 编辑
修改之前的项目activity_main- <?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/take_photo"
- android:layout_width="match_parent"
- android:layout_height="wrap_content"
- android:text="take photo"/>
- <Button
- android:id="@+id/choose_from_album"
- android:layout_width="match_parent"
- android:layout_height="wrap_content"
- android:text="choose_from_album"/>
- <ImageView
- android:id="@+id/picture"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:layout_gravity="center_horizontal"/>
- </LinearLayout>
复制代码
mainactivity.java- package com.example.xinwei.cameraalbumtest;
- import android.Manifest;
- import android.content.ContentUris;
- import android.content.Intent;
- import android.content.pm.PackageManager;
- import android.database.Cursor;
- import android.graphics.Bitmap;
- import android.graphics.BitmapFactory;
- import android.net.Uri;
- import android.os.Build;
- import android.provider.DocumentsContract;
- import android.provider.MediaStore;
- import android.support.annotation.NonNull;
- import android.support.v4.app.ActivityCompat;
- import android.support.v4.content.ContextCompat;
- import android.support.v4.content.FileProvider;
- import android.support.v7.app.AlertDialog;
- import android.support.v7.app.AppCompatActivity;
- import android.os.Bundle;
- import android.view.View;
- import android.widget.Button;
- import android.widget.ImageView;
- import android.widget.Toast;
- import java.io.File;
- import java.io.FileNotFoundException;
- import java.io.IOException;
- public class MainActivity extends AppCompatActivity {
- public static final int TAKE_PHOTO=1;
- public static final int CHOOSE_PHOTO=2;
- private ImageView picture;
- private Uri imageUri;
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.activity_main);
- Button takePhoto=(Button)findViewById(R.id.take_photo);
- picture = (ImageView)findViewById(R.id.picture);
- takePhoto.setOnClickListener(new View.OnClickListener() {
- @Override
- public void onClick(View view) {
- File outputImage = new File(getExternalCacheDir(),"output_image.jpg");
- if (outputImage.exists()){
- outputImage.delete();
- }
- try {
- outputImage.createNewFile();
- } catch (IOException e) {
- e.printStackTrace();
- }
- if (Build.VERSION.SDK_INT>=24){
- imageUri= FileProvider.getUriForFile(MainActivity.this,"com.example.xinwei.cameraalbumtest.fileprovider",outputImage);
- }else{
- imageUri=Uri.fromFile(outputImage);
- }
- Intent intent=new Intent("android.media.action.IMAGE_CAPTURE");
- intent.putExtra(MediaStore.EXTRA_OUTPUT,imageUri);
- startActivityForResult(intent,TAKE_PHOTO);
- }
- });
- choosePhoto();
- }
- private void choosePhoto() {
- Button chooseFromAlbum = (Button)findViewById(R.id.choose_from_album);
- chooseFromAlbum.setOnClickListener(new View.OnClickListener() {
- @Override
- public void onClick(View view) {
- if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.WRITE_EXTERNAL_STORAGE)!= PackageManager.PERMISSION_GRANTED){
- ActivityCompat.requestPermissions(MainActivity.this,new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},1);
- }else{
- openAlbum();
- }
- }
- });
- }
- private void openAlbum() {
- Intent intent = new Intent("android.intent.action.GET_CONTENT");
- intent.setType("image/*");
- startActivityForResult(intent,CHOOSE_PHOTO);
- }
- @Override
- protected void onActivityResult(int requestCode, int resultCode, Intent data) {
- super.onActivityResult(requestCode, resultCode, data);
- switch (requestCode){
- case TAKE_PHOTO:
- if(resultCode==RESULT_OK){
- try {
- Bitmap bitmap= BitmapFactory.decodeStream(getContentResolver().openInputStream(imageUri));
- picture.setImageBitmap(bitmap);
- } catch (FileNotFoundException e) {
- e.printStackTrace();
- }
- }
- break;
- case CHOOSE_PHOTO:
- if(requestCode==RESULT_OK){
- if(Build.VERSION.SDK_INT>=19){
- handleImageOnKitKat(data);
- }else {
- handleImageBeforeKitKat(data);
- }
- }
- default:
- break;
- }
- }
- private void handleImageBeforeKitKat(Intent data) {
- Uri uri=data.getData();
- String imagePath=getImagePath(uri,null);
- displayImage(imagePath);
- }
- private void handleImageOnKitKat(Intent data) {
- String imagePath=null;
- Uri uri=data.getData();
- if(DocumentsContract.isDocumentUri(this,uri)){
- String docId=DocumentsContract.getDocumentId(uri);
- if("com.android.providers.media.documents".equals(uri.getAuthority())){
- String id=docId.split(":")[1];
- String selection=MediaStore.Images.Media._ID+"="+id;
- imagePath=getImagePath(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,selection);
- }else if ("com.android.providers.downloads.documents".equals(uri.getAuthority())){
- Uri contentUri= ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"),Long.valueOf(docId));
- imagePath=getImagePath(contentUri,null);
- }
- }else if ("content".equalsIgnoreCase(uri.getScheme())){
- imagePath=getImagePath(uri,null);
- }else if ("file".equalsIgnoreCase(uri.getScheme())){
- imagePath=uri.getPath();
- }
- displayImage(imagePath);
- }
- private void displayImage(String imagePath) {
- if (imagePath!=null){
- Bitmap bitmap = BitmapFactory.decodeFile(imagePath);
- picture.setImageBitmap(bitmap);
- }else {
- Toast.makeText(this, "failed to get image", Toast.LENGTH_SHORT).show();
- }
- }
- private String getImagePath(Uri uri, String selection) {
- String path=null;
- Cursor cursor = getContentResolver().query(uri,null,selection,null,null);
- if (cursor!=null){
- if (cursor.moveToFirst()){
- path=cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DATA));
- }
- cursor.close();
- }
- return path;
- }
- @Override
- public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
- super.onRequestPermissionsResult(requestCode, permissions, grantResults);
- switch (requestCode){
- case 1:
- if(grantResults.length>0&&grantResults[0]==PackageManager.PERMISSION_GRANTED){
- openAlbum();
- }else{
- Toast.makeText(this, "You denied zhe permission", Toast.LENGTH_SHORT).show();
- }
- break;
- default:
- }
- }
- }
复制代码 这个代码又多又复杂最好是照抄就行了,另外因为手机模拟器上没有照片所以显示不出来,需要先拍几张黑屏才行。 |
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