Android 调用摄像头拍照并裁剪

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:weightSum="1">
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text="@string/title"
        android:id="@+id/textView"
        android:layout_gravity="center_horizontal" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/button"
        android:id="@+id/button"
        android:layout_marginTop="20dp"
        android:layout_gravity="center_horizontal" />

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/imageView"
        android:layout_gravity="center_horizontal"
        android:layout_marginTop="40dp" />


</LinearLayout>

strings.xml

<resources>
    <string name="app_name">Camera</string>
    <string name="title">摄像头打开示例</string>
    <string name="button">点击打开摄像头</string>
</resources>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="pw.pw11.camera">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        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>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
</manifest>

MainActivity.java

package pw.pw11.camera;

import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Environment;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;

public class MainActivity extends AppCompatActivity {
    public static final int TAKE_PHOTO = 1;
    public static final int CROP_PHOTO = 2;
    private Button button = null;
    private ImageView imageview = null;
    private Uri imageUri = null;
    public void InitViews(){
        button =(Button)findViewById(R.id.button);
        imageview =(ImageView)findViewById(R.id.imageView);
    }
    public void InitEvents(){
        button.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                File file = new File(Environment.getExternalStorageDirectory(), "tempImage.jpg");
                try {
                    if (file.exists()) {
                        file.delete();
                    }
                    file.createNewFile();
                } catch (IOException e) {
                    e.printStackTrace();
                }
                imageUri = Uri.fromFile(file);
                Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
                intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
                startActivityForResult(intent, TAKE_PHOTO); // 启动相机程序
            }
        });
    }
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        InitViews();
        InitEvents();
    }
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        switch (requestCode) {
            case TAKE_PHOTO:
                if (resultCode == RESULT_OK) {
                    Intent intent = new Intent("com.android.camera.action.CROP");
                    intent.setDataAndType(imageUri, "image/*");
                    intent.putExtra("scale", true);
                    intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
                    startActivityForResult(intent, CROP_PHOTO); // 启动裁剪程序
                }
                break;
            case CROP_PHOTO:
                if (resultCode == RESULT_OK) {
                    try {
                        String path = imageUri.getPath();
                        FileInputStream fis = new FileInputStream(path);
                        Bitmap bitmap = BitmapFactory.decodeStream(fis);
                        imageview.setImageBitmap(bitmap); // 将裁剪后的照片显示出来
                    } catch (FileNotFoundException e) {
                        e.printStackTrace();
                    }
                }
                break;
            default:
                break;
        }
    }
}