Android拍照或者从相册选取图片加载在imageview上，代码怎么写

### 回答1：
你可以使用以下代码实现：

// 拍照
private static final int REQUEST_IMAGE_CAPTURE = 1;

private void dispatchTakePictureIntent() {
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
}
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {
Bundle extras = data.getExtras();
Bitmap imageBitmap = (Bitmap) extras.get("data");
imageView.setImageBitmap(imageBitmap);
}
}

// 从相册选取图片
private static final int REQUEST_IMAGE_GET = 2;

private void dispatchGetPictureIntent() {
Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.setType("image/*");
if (intent.resolveActivity(getPackageManager()) != null) {
startActivityForResult(intent, REQUEST_IMAGE_GET);
}
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == REQUEST_IMAGE_GET && resultCode == RESULT_OK) {
try {
InputStream inputStream = getContentResolver().openInputStream(data.getData());
Bitmap bitmap = BitmapFactory.decodeStream(inputStream);
imageView.setImageBitmap(bitmap);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}
}

以上代码中，dispatchTakePictureIntent() 方法用于启动相机拍照，dispatchGetPictureIntent() 方法用于从相册选取图片。在 onActivityResult() 方法中，根据 requestCode 和 resultCode 判断是哪种操作，然后获取图片并设置到 imageView 上。

### 回答2：
在Android中，你可以通过以下方式拍照或从相册中选取图片并将其加载在ImageView上。

首先，在你的布局文件中添加一个ImageView元素，用于显示拍照或选取的照片：

<ImageView
    android:id="@+id/imageView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />

然后，在你的Activity或Fragment中，通过以下代码实现拍照或选取照片的功能：

import android.Manifest;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.provider.MediaStore;
import android.view.View;
import android.widget.ImageView;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;

public class MainActivity extends AppCompatActivity {

    private static final int REQUEST_CAMERA = 1;
    private static final int REQUEST_GALLERY = 2;

    private ImageView imageView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        imageView = findViewById(R.id.imageView);
    }

    public void takePhoto(View view) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED) {
                openCamera();
            } else {
                ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.CAMERA}, REQUEST_CAMERA);
            }
        } else {
            openCamera();
        }
    }

    public void openGallery(View view) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            if (ContextCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED) {
                Intent intent = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
                startActivityForResult(intent, REQUEST_GALLERY);
            } else {
                ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, REQUEST_GALLERY);
            }
        } else {
            Intent intent = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
            startActivityForResult(intent, REQUEST_GALLERY);
        }
    }

    private void openCamera() {
        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        startActivityForResult(intent, REQUEST_CAMERA);
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if (requestCode == REQUEST_CAMERA) {
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                openCamera();
            } else {
                Toast.makeText(this, "Camera permission denied", Toast.LENGTH_SHORT).show();
            }
        } else if (requestCode == REQUEST_GALLERY) {
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                openGallery(null);
            } else {
                Toast.makeText(this, "Storage permission denied", Toast.LENGTH_SHORT).show();
            }
        }
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (resultCode == RESULT_OK) {
            if (requestCode == REQUEST_CAMERA) {
                Bitmap photo = (Bitmap) data.getExtras().get("data");
                imageView.setImageBitmap(photo);
            } else if (requestCode == REQUEST_GALLERY) {
                Uri imageUri = data.getData();
                imageView.setImageURI(imageUri);
            }
        }
    }
}

以上代码中，我们首先检查相机和存储权限。如果权限已经授予，我们就可以打开相机或者打开相册。在onActivityResult()方法中，我们从返回的数据获取照片，并将其设置在ImageView上。

为了正常运行，请确保在AndroidManifest.xml文件中添加以下权限：

<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

还需要添加所需的Activity：

<activity android:name=".MainActivity">
    // ...
</activity>

以上就是通过Android拍照或从相册选取图片并加载在ImageView上的代码实现。

### 回答3：
在Android平台上，我们可以通过一些简单的代码实现拍照或从相册选取图片，并将其加载到ImageView上。

1. 拍照功能：
首先，我们需要在manifest文件中添加相机权限。在AndroidManifest.xml文件中添加以下行：

<uses-permission android:name="android.permission.CAMERA" />

然后，在点击按钮或其他触发事件时，使用以下代码来实现拍照功能：

private static final int REQUEST_IMAGE_CAPTURE = 1;

private void dispatchTakePictureIntent() {
    Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
        startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
    }
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {
        Bitmap imageBitmap = (Bitmap) data.getExtras().get("data");
        imageView.setImageBitmap(imageBitmap);
    }
}

2. 从相册选取图片：
同样，我们需要在manifest文件中添加读取相册权限。在AndroidManifest.xml文件中添加以下行：

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

接下来，在点击按钮或其他触发事件时，可以使用以下代码实现从相册选取图片功能：

private static final int PICK_IMAGE_REQUEST = 2;

private void showFileChooser() {
    Intent intent = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
    intent.setType("image/*");
    intent.setAction(Intent.ACTION_GET_CONTENT);
    startActivityForResult(intent, PICK_IMAGE_REQUEST);
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == PICK_IMAGE_REQUEST && resultCode == RESULT_OK) {
        Uri selectedImageUri = data.getData();
        try {
            Bitmap bitmap = MediaStore.Images.Media.getBitmap(getContentResolver(), selectedImageUri);
            imageView.setImageBitmap(bitmap);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

以上是拍照和从相册选取图片加载在ImageView上的简单示例代码。不同的项目和需求可能会有所差异，您可以根据您的具体情况进行调整和扩展。