lab08 #94

app/src/main/java/edu/hzuapps/androidworks/homeworks/net1314080903208/CustomCameraActivity.java

@@ -0,0 +1,172 @@
+package skyward.com.camera;
+
+import android.app.Activity;
+import android.content.Intent;
+import android.graphics.ImageFormat;
+import android.hardware.Camera;
+import android.os.Bundle;
+import android.util.Log;
+import android.view.SurfaceHolder;
+import android.view.SurfaceView;
+import android.view.View;
+
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.IOException;
+
+/**
+ * 自定义相机
+ * 1.创建Camera对象
+ * 2.创建SurfaceView对象
+ * 3.关联Camera对象和SurfaceView对象
+ * 4.调整相机的显示效果
+ * 5.自定义相机预览界面
+ * Created by skyward on 2016/4/29.
+ */
+public class CustomCameraActivity extends Activity implements SurfaceHolder.Callback{
+    private static final String TAG = "CustomCameraActivity";
+    private Camera mCamera;
+    private SurfaceView mPreview;
+    private SurfaceHolder mHolder;
+    private Camera.PictureCallback mPictureCallback = new Camera.PictureCallback() {
+        @Override
+        public void onPictureTaken(byte[] data, Camera camera) {
+            //生成照片
+            File tempFile = new File("/sdcard/temp.png");
+            try {
+                FileOutputStream fos = new FileOutputStream(tempFile);
+                fos.write(data);
+                fos.close();
+                Intent intent = new Intent(CustomCameraActivity.this, ResultActivity.class);
+                Log.d(TAG, "onPictureTaken: " + tempFile.getAbsolutePath());
+                intent.putExtra("picPath", tempFile.getAbsolutePath());
+                startActivity(intent);
+                CustomCameraActivity.this.finish();
+            } catch (FileNotFoundException e) {
+                e.printStackTrace();
+            } catch (IOException e) {
+                e.printStackTrace();
+            }
+        }
+    };
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_custom_camera);
+        //2.创建SurfaceView对象
+        mPreview = (SurfaceView) findViewById(R.id.preview);
+        // 点击屏幕时自动对焦
+        mPreview.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                mCamera.autoFocus(null);
+            }
+        });
+        //获取SurfaceHolder对象
+        mHolder = mPreview.getHolder();
+        mHolder.addCallback(this);
+    }
+
+    /**
+     * 拍照
+     * @param view
+     */
+    public void capture(View view) {
+        //4.调整相机的显示效果
+        //参数设置
+        Camera.Parameters parameters = mCamera.getParameters();
+        //设置照片格式
+        parameters.setPictureFormat(ImageFormat.JPEG);
+        parameters.setPreviewSize(1280, 720);
+        //设置对焦模式为自动对焦
+        parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_AUTO);
+        mCamera.autoFocus(new Camera.AutoFocusCallback() {
+            @Override
+            public void onAutoFocus(boolean success, Camera camera) {
+                //当对焦成功，则拍照
+                if (success) {
+                    mCamera.takePicture(null, null, mPictureCallback);
+                }
+            }
+        });
+    }
+
+    @Override
+    protected void onResume() {
+        super.onResume();
+        if(mCamera == null) {
+            // 1.创建Camera对象
+            mCamera = getCamera();
+            if (mHolder != null) {
+                setStartPreview(mCamera, mHolder);
+            }
+        }
+    }
+
+    @Override
+    protected void onPause() {
+        super.onPause();
+        releaseCamera();
+    }
+
+    /**
+     * 获取系统Camera对象
+     * @return
+     */
+    private Camera getCamera() {
+        Camera camera;
+        try {
+            camera = Camera.open();
+        } catch (Exception e) {
+            camera = null;
+            e.printStackTrace();
+        }
+        return  camera;
+    }
+
+    /**
+     * 开始预览相机内容
+     */
+    private void setStartPreview(Camera camera, SurfaceHolder holder) {
+        try {
+            //3.关联Camera对象和SurfaceView对象
+            camera.setPreviewDisplay(holder);
+            //系统默认横屏显示
+            //因此要将系统camera预览角度调整90度
+            camera.setDisplayOrientation(90);
+            camera.startPreview();
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+
+    /**
+     * 释放相机资源
+     */
+    private void releaseCamera() {
+        if (mCamera != null) {
+            mCamera.setPreviewCallback(null);
+            mCamera.stopPreview();
+            mCamera.release();
+            mCamera = null;
+        }
+    }
+
+    @Override
+    public void surfaceCreated(SurfaceHolder holder) {
+        setStartPreview(mCamera, mHolder);
+    }
+
+    @Override
+    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
+        mCamera.stopPreview();
+        setStartPreview(mCamera, mHolder);
+    }
+
+    @Override
+    public void surfaceDestroyed(SurfaceHolder holder) {
+        releaseCamera();
+    }
+}

app/src/main/java/edu/hzuapps/androidworks/homeworks/net1314080903208/MActivity.java

@@ -0,0 +1,119 @@
+package skyward.com.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.util.Log;
+import android.view.View;
+import android.widget.ImageView;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+
+/**
+ *
+ */
+public class MActivity extends AppCompatActivity {
+    public static final int REQUEST_CODE_1 = 1;
+    public static final int REQUEST_CODE_2 = 2;
+    private static final String TAG = "MActivity";
+    //文件路径
+    private String mFilePath;
+
+    private ImageView iv;
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_m);
+        iv = (ImageView) findViewById(R.id.iv);
+        //获取SD卡路径（外部存储路径）  /storage/emulated/0
+        mFilePath = Environment.getExternalStorageDirectory().getPath();
+        Log.d(TAG, "onCreate: " + mFilePath);
+        //获取公共外部存储空间路径 /storage/emulated/0/Pictures
+//        File file = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
+//        Log.d(TAG, "onCreate: " + file.getAbsolutePath());
+        mFilePath = mFilePath + "/temp.png";
+    }
+
+    /**
+     * 调用系统相机（返回缩略图）
+     * @param view
+     */
+    public void startCamera1(View view) {
+        //通过隐式intent启动相机应用
+        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
+        startActivityForResult(intent, REQUEST_CODE_1);
+    }
+
+    /**
+     * 调用系统相机（返回原图）
+     * @param view
+     */
+    public void startCamera2(View view) {
+        //通过隐式intent启动相机应用
+        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
+        Uri photoUri = Uri.fromFile(new File(mFilePath));
+        //修改系统保存图片的路径
+        intent.putExtra(MediaStore.EXTRA_OUTPUT, photoUri);
+        startActivityForResult(intent, REQUEST_CODE_2);
+    }
+
+    /**
+     * 调用自定义相机
+     * @param view
+     */
+    public void customCamera(View view) {
+        Intent intent = new Intent(MActivity.this, CustomCameraActivity.class);
+        startActivity(intent);
+    }
+
+    //将照片添加至系统相册
+    private void galleryAddPic() {
+        Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
+        File f = new File(mFilePath);
+        Uri contentUri = Uri.fromFile(f);
+        mediaScanIntent.setData(contentUri);
+        this.sendBroadcast(mediaScanIntent);
+    }
+
+    @Override
+    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
+        super.onActivityResult(requestCode, resultCode, data);
+        if(resultCode == RESULT_OK) {
+            if(requestCode == REQUEST_CODE_1) {
+                /**
+                 * 系统相机默认返回的bitmap为缩略图
+                 */
+                Bundle bundle = data.getExtras();
+                Bitmap bitmap = (Bitmap) bundle.get("data");
+                iv.setImageBitmap(bitmap);
+            } else if(requestCode == REQUEST_CODE_2) {
+                /**
+                 * 要想使系统相机返回原图
+                 * 1.修改系统默认保存照片路径
+                 * 2.自定义照片文件保存路径，在调用系统相机之前，将路径作为参数传递给系统相机
+                 * 3.创建文件输入流，读取照片文件并转换为Bitmap，显示在ImageView中
+                 *
+                 * 有可能会因为照片文件过大以致抛出内存溢出异常，不能够将照片显示在ImageView中
+                 */
+                try {
+                    FileInputStream fis = new FileInputStream(mFilePath);
+                    Bitmap bitmap = BitmapFactory.decodeStream(fis);
+                    Log.d(TAG, "onActivityResult: 读取图片");
+                    iv.setImageBitmap(bitmap);
+                    galleryAddPic();
+                } catch (FileNotFoundException e) {
+                    e.printStackTrace();
+                } finally {
+
+                }
+            }
+        }
+    }
+}

app/src/main/java/edu/hzuapps/androidworks/homeworks/net1314080903208/ResultActivity.java

@@ -0,0 +1,41 @@
+package skyward.com.camera;
+
+import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
+import android.graphics.Matrix;
+import android.support.v7.app.AppCompatActivity;
+import android.os.Bundle;
+import android.widget.ImageView;
+
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+
+/**
+ * 5.自定义相机预览界面
+ * 相片预览界面
+ */
+public class ResultActivity extends AppCompatActivity {
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_result);
+        //获取相片所在的路径
+        String path = getIntent().getStringExtra("picPath");
+        ImageView pic = (ImageView) findViewById(R.id.pic);
+        //系统默认拍摄的相片为横屏显示，因此要将图片旋转90度后再显示
+        try {
+            FileInputStream fis = new FileInputStream(path);
+            Bitmap bitmap = BitmapFactory.decodeStream(fis);
+            Matrix matrix = new Matrix();
+            //将图片旋转90度
+            matrix.setRotate(90);
+            bitmap = Bitmap.createBitmap(bitmap, 0,0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);
+            pic.setImageBitmap(bitmap);
+        } catch (FileNotFoundException e) {
+            e.printStackTrace();
+        }
+//        Bitmap bitmap = BitmapFactory.decodeFile(path);
+//        pic.setImageBitmap(bitmap);
+    }
+}

app/src/main/res/layout/activity_custom_camera.xml

@@ -0,0 +1,33 @@
+<?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">
+
+    <Button
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="capture"
+        android:onClick="capture"/>
+
+    <RelativeLayout
+        android:layout_width="match_parent"
+        android:layout_height="match_parent">
+
+        <SurfaceView
+            android:id="@+id/preview"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent" />
+
+        <TextView
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:text="welcom to My Camera"
+            android:gravity="center"
+            android:layout_marginBottom="80dp"
+            android:textColor="#e40e31"
+            android:layout_alignParentBottom="true"
+            android:layout_alignParentLeft="true"
+            android:layout_alignParentStart="true" />
+    </RelativeLayout>
+
+</LinearLayout>