Android图片是必不可少的，在一些大的应用都会有选择图片或者发送刚刚拍摄的图片的功能，现在我们就来实现一个调用摄像头和相册的功能。由于Android版本的更新，Android7.0对于调用摄像头，及相片分享有了一些新的改动了。
调用摄像头拍照并显示的步骤：
- 创建储存的File
- 判断API版本分类出来
- 获取Uri
- 启动相机
- 展示图片
调用相册并显示的步骤：
- 判断有无权限没有则添加
- 调取相册
- 判断API版本
- 判断Uri类型
- 获取Uri
- 展示图片
AndroidManifest XML代码：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.administrator.foundationdemo">
<!-- 访问SD权限 -->
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<application
android:allowBackup="true"
android:configChanges="keyboardHidden|screenSize|orientation"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".getphoto.GetPhotoActivity"></activity>
<!-- 7.0图片共享 -->
<provider
android:authorities="com.example.cameraalbumtest.fileprovider"
android:name="android.support.v4.content.FileProvider"
android:exported="false"
android:grantUriPermissions="true">
<meta-data android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/file_paths"/>
</provider>
</application>
</manifest>
GetPhotoActivity 类代码
package com.example.administrator.foundationdemo.getphoto;
import android.Manifest;
import android.annotation.TargetApi;
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.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v4.content.FileProvider;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;
import com.example.administrator.foundationdemo.R;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
public class GetPhotoActivity extends AppCompatActivity {
public static final int TAKE_PHOTO = 1;//拍照
public static final int CHOOSE_PHOTO = 2;//相册获取
private Button take_photo ;
private Button chooser_photo;
private ImageView img_photo;
private Uri imgUri;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
initView();
}
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
switch (requestCode){
case 1:
if (grantResults.length>0 && grantResults[0]==PackageManager.PERMISSION_GRANTED){
openAlbum();
}else {
Toast.makeText(GetPhotoActivity.this,"You denied the permission",Toast.LENGTH_SHORT).show();
}
break;
default:
break;
}
}
@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(imgUri));
img_photo.setImageBitmap(bitmap);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}
break;
case CHOOSE_PHOTO:
if (resultCode == RESULT_OK){
if (Build.VERSION.SDK_INT >=19){
//4.4以上图片处理
handleImageOnKitKat(data);
}else {
//4.4以下图片处理
handleImageBeforeKitKat(data);
}
}
break;
default:
break;
}
}
@TargetApi(19)
private void handleImageBeforeKitKat(Intent data) {
String imagePath = null;
Uri uri = data.getData();
if (DocumentsContract.isDocumentUri(this,uri)){
//如果是 documents 类型的Uri ，则通过 document id 处理
String docId = DocumentsContract.getDocumentId(uri);
if ("com.android.providers.media.documents".equals(uri.getAuthority()) ){
String id = docId.split(":")[1];//解析出数字格式的id
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())){
//如果是 content 类型的 Uri，则使用普通方式
imagePath = getImagePath(uri,null);
}else if ("file".equalsIgnoreCase(uri.getScheme())){
//如果是 file 类型的 Uri，直接获取图片路径即可
imagePath = uri.getPath();
}
displayImage(imagePath);
}
private void handleImageOnKitKat(Intent data) {
Uri uri = data.getData();
String imagePath = getImagePath(uri, null);
displayImage(imagePath);
}
private void displayImage(String imagePath) {
if (null == imagePath && "".equals(imagePath)){
Toast.makeText(GetPhotoActivity.this,"ImafePath is null",Toast.LENGTH_SHORT).show();
return;
}
Bitmap bitmap = BitmapFactory.decodeFile(imagePath);
img_photo.setImageBitmap(bitmap);
}
private String getImagePath(Uri uri, String selection) {
String path = null;
//通过Uri和selection获取真实的图片路径
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;
}
private void initView() {
setContentView(R.layout.activity_get_photo);
take_photo = (Button) findViewById(R.id.photo_take);
img_photo = (ImageView) findViewById(R.id.photo_img);
chooser_photo = (Button) findViewById(R.id.photo_chooser);
//调用摄像头
take_photo.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
try {
camera();
} catch (IOException e) {
e.printStackTrace();
Log.d("FLY","出错了====="+e.toString());
}
}
});
//调用相册
chooser_photo.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//判断有无权限没有则添加
if (ContextCompat.checkSelfPermission(GetPhotoActivity.this, Manifest.permission.WRITE_EXTERNAL_STORAGE)!= PackageManager.PERMISSION_GRANTED){
ActivityCompat.requestPermissions(GetPhotoActivity.this,new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},1);
}else {
openAlbum();
}
}
});
}
private void openAlbum() {
//调取相册
Intent intent = new Intent("android.intent.action.GET_CONTENT");
intent.setType("image/*");
startActivityForResult(intent,CHOOSE_PHOTO);
}
private void camera() throws IOException {
//储存拍照图片file
File outputImage = new File(getExternalCacheDir(),"putput_img.jpg");
if (outputImage.exists()){
outputImage.delete();
}
outputImage.createNewFile();
//
if (Build.VERSION.SDK_INT>=24){
//7.0以上新增的方法 共享文件 FileProvider是一种特殊的内容提供者
// 第二个参数为对应filepaths.xml中provider（内容提供者的）的name
imgUri = FileProvider
.getUriForFile(GetPhotoActivity.this,"com.example.cameraalbumtest.fileprovider",outputImage);
}else {
imgUri = Uri.fromFile(outputImage);
}
//启动相机
Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
intent.putExtra(MediaStore.EXTRA_OUTPUT,imgUri);
startActivityForResult(intent,TAKE_PHOTO);
}
}
activity_get_photo XML代码：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
style="@style/MatchMatch"
android:orientation="vertical"
tools:context="com.example.administrator.foundationdemo.getphoto.GetPhotoActivity">
<Button
android:id="@+id/photo_take"
style="@style/MatchWrap"
android:text="Take Photo" />
<Button
android:id="@+id/photo_chooser"
style="@style/MatchWrap"
android:text="chooser photo"
/>
<ImageView
android:id="@+id/photo_img"
style="@style/WrapWrap"
android:src="@mipmap/ic_launcher"
android:layout_gravity="center"/>
</LinearLayout>
效果图：
这里写图片描述
希望对你们有帮助谢谢！！！！！
