1.权限申请
注意这里的权限 1.主要是读写权限；2.fileprovider的权限，因为app要用照相机里的文件
2.照相机使用的开发
package cn.fc.cameraalbumtest;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import androidx.core.content.FileProvider;
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.os.Bundle;
import android.provider.DocumentsContract;
import android.provider.MediaStore;
import android.util.Log;
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;
private final String TAG = "MainActivity";
@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);
Button chooseFromAlbum = (Button)findViewById(R.id.choose_from_album);
chooseFromAlbum.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (Build.VERSION.SDK_INT >= 23) {
int REQUEST_CODE_PERMISSION_STORAGE = 2;
String[] permissions = {
Manifest.permission.WRITE_EXTERNAL_STORAGE
};
for (String str : permissions) {
if (ContextCompat.checkSelfPermission(MainActivity.this, str) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(MainActivity.this, new String[]{
str}, REQUEST_CODE_PERMISSION_STORAGE);
} else {
openAlbum();
}
}
}
}
});
takePhoto.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// 大坑，动态注册权限
if (Build.VERSION.SDK_INT >= 23) {
int REQUEST_CODE_PERMISSION_STORAGE = 1;
String[] permissions = {
Manifest.permission.READ_EXTERNAL_STORAGE,
Manifest.permission.WRITE_EXTERNAL_STORAGE
};
for (String str : permissions) {
if (ContextCompat.checkSelfPermission(MainActivity.this, str) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(MainActivity.this, new String[]{
str}, REQUEST_CODE_PERMISSION_STORAGE);
}
}
}
// 创建一个文件用于存储拍照后的图片
File outputImage = new File(getExternalCacheDir(), "output_image.jpg");
try {
if(outputImage.exists()){
outputImage.delete();
}
outputImage.createNewFile();
}catch (IOException e){
e.printStackTrace();
}
if (Build.VERSION.SDK_INT >= 24){
imageUri = FileProvider.getUriForFile(MainActivity.this, "cn.fc.cameraalbumtest.fileProvider", outputImage);
} else {
imageUri = Uri.fromFile(outputImage);
}
// 启动相机
Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
startActivityForResult(intent, TAKE_PHOTO);
}
});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data){
switch (requestCode){
case TAKE_PHOTO:
if (resultCode == RESULT_OK){
try{
// 将拍摄的照片显示出来
Bitmap bitmap = BitmapFactory.decodeStream(getContentResolver().openInputStream(imageUri));
picture.setImageBitmap(bitmap);
} catch (FileNotFoundException e){
e.printStackTrace();
}
}
break;
case CHOOSE_PHOTO:
if(requestCode == RESULT_OK){
// 判断手机的系统版本号
if (Build.VERSION.SDK_INT >= 19){
// 4.4以上的版本用这个版本处理图片
handleImageOnKitKat(data);
} else {
// 4.4以下系统用这个版本处理图片
}
}
break;
default:
break;
}
}
private void openAlbum(){
Intent intent = new Intent("android.intent.action.GET_CONTENT");
Log.d(TAG, "get----------intent");
intent.setType("Image/*");
startActivityForResult(intent, CHOOSE_PHOTO);
}
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults){
switch (requestCode){
case 2:
if(grantResults.length >0 && grantResults[0] == PackageManager.PERMISSION_GRANTED){
openAlbum();
} else {
Toast.makeText(MainActivity.this, "You denied the permission", Toast.LENGTH_SHORT).show();
}
break;
default:
break;
}
}
@TargetApi(19)
public void handleImageOnKitKat(Intent data){
Log.d(TAG, "get image data---------------->" + data);
String imagePath = null;
Uri uri = data.getData();
if (DocumentsContract.isDocumentUri(this, uri)){
// 如果是document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())){
imagePath = getImagePath(uri, null);
} else if ("file".equalsIgnoreCase(uri.getScheme())){
imagePath = uri.getPath();
}
Log.d(TAG, "get image path---------------->" + imagePath);
displayImage(imagePath);
}
}
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;
};
private void displayImage(String path){
if (path != null){
Bitmap bitmap = BitmapFactory.decodeFile(path);
Log.d(TAG, "show img------------------>" + path);
picture.setImageBitmap(bitmap);
} else {
Toast.makeText(MainActivity.this, "failed to get image", Toast.LENGTH_SHORT).show();
}
}
}