Android自訂相機實現自動對焦和手動對焦_Android

Android自訂相機實現自動對焦和手動對焦：
不調用系統相機，因為不同的機器開啟相機呈現的介面不統一也不能滿足需求。
所以為了讓程式在不同的機器上呈現出統一的介面，並且可以根據需求進行布局，做了此demo。

程式實現代碼如下：

import java.io.File;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.lang.reflect.Method;import android.graphics.PixelFormat;import android.hardware.Camera;import android.hardware.Camera.AutoFocusCallback;import android.hardware.Camera.Parameters;import android.hardware.Camera.PictureCallback;import android.hardware.Camera.ShutterCallback;import android.os.Build;import android.os.Bundle;import android.util.Log;import android.view.SurfaceHolder;import android.view.SurfaceView;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import com.hp.classes.config.Constants;import com.hp.classes.tools.CommonUtils;import com.hp.classes.ui.BaseActivity;@SuppressWarnings("deprecation")public class PhotographActivity extends BaseActivity implements OnClickListener, SurfaceHolder.Callback {  private SurfaceView surfaceView;  private Camera camera;  private Camera.Parameters parameters;  private Button btn_goback, btn_takephoto;  private SurfaceHolder surfaceHolder;    @Override  protected void onDestroy() {    super.onDestroy();    if(camera != null){      camera.stopPreview();      camera.release();      camera = null;    }  }    @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.classes_activity_takephoto);    initView();  }  @Override  protected void onResume() {    super.onResume();    initCamera();  }  private void initView(){    btn_goback = (Button) findViewById(R.id.btn_goback);    btn_goback.setOnClickListener(this);    btn_takephoto = (Button) findViewById(R.id.btn_takephoto);    btn_takephoto.setOnClickListener(this);    surfaceView = (SurfaceView) findViewById(R.id.surfaceView);    surfaceView.setFocusable(true);    surfaceView.setOnClickListener(this);    surfaceView.setBackgroundColor(TRIM_MEMORY_BACKGROUND);    surfaceHolder = surfaceView.getHolder();    surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);    surfaceHolder.setKeepScreenOn(true);    surfaceHolder.setFixedSize(400, 300);    surfaceHolder.addCallback(this);  }  @Override  public void surfaceDestroyed(SurfaceHolder holder) {    // TODO Auto-generated method stub    camera.stopPreview();    camera.release();    camera = null;  }  @Override  public void surfaceCreated(SurfaceHolder holder) {    // TODO Auto-generated method stub    try {      camera.setPreviewDisplay(surfaceHolder);    } catch (IOException e) {      e.printStackTrace();    }  }  @Override  public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {    // 實現自動對焦    camera.autoFocus(new AutoFocusCallback() {      @Override      public void onAutoFocus(boolean success, Camera camera) {        if (success) {          camera.cancelAutoFocus();// 只有加上了這一句，才會自動對焦          doAutoFocus();        }      }    });  }  // 相機參數的初始化設定  private void initCamera() {    if (null == camera) {      camera = Camera.open();    }    parameters = camera.getParameters();    parameters.setPictureFormat(PixelFormat.JPEG);    parameters.setFlashMode(Parameters.FLASH_MODE_TORCH);    if (!Build.MODEL.equals("KORIDY H30")) {      parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE);// 1連續對焦    }else{      parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_AUTO);    }    camera.setParameters(parameters);    setDispaly(camera);    camera.startPreview();    camera.cancelAutoFocus();// 2如果要實現連續的自動對焦，這一句必須加上  }  // 控製圖像的正確顯示方向  private void setDispaly(Camera camera) {    if (Integer.parseInt(Build.VERSION.SDK) >= 8) {      setDisplayOrientation(camera, -90);    } else {      parameters.setRotation(-90);    }  }  // 實現的映像的正確顯示  private void setDisplayOrientation(Camera camera, int i) {    Method downPolymorphic;    try {      downPolymorphic = camera.getClass().getMethod("setDisplayOrientation", new Class[] { int.class });      if (downPolymorphic != null) {        downPolymorphic.invoke(camera, new Object[] { i });      }    } catch (Exception e) {      Log.e("Came_e", "映像出錯");    }  }  @Override  public void onClick(View v) {    switch (v.getId()) {    case R.id.surfaceView:      doAutoFocus();      break;    case R.id.btn_takephoto:      takePicture();      break;    case R.id.btn_goback:      finish();      break;    default:      break;    }  }  // handle button auto focus  private void doAutoFocus() {    parameters = camera.getParameters();    parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_AUTO);    camera.setParameters(parameters);    camera.autoFocus(new AutoFocusCallback() {      @Override      public void onAutoFocus(boolean success, Camera camera) {        if (success) {          camera.cancelAutoFocus();// 只有加上了這一句，才會自動對焦。          if (!Build.MODEL.equals("KORIDY H30")) {            parameters = camera.getParameters();            parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE);// 1連續對焦            camera.setParameters(parameters);          }else{            parameters = camera.getParameters();            parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_AUTO);            camera.setParameters(parameters);          }        }      }    });  }  private void takePicture() {    camera.takePicture(shutterCallback, rawCallback, jpegCallback);  }  // define shutterCallback  ShutterCallback shutterCallback = new ShutterCallback() {    public void onShutter() {      // TODO Do something when the shutter closes.    }  };  PictureCallback rawCallback = new PictureCallback() {    public void onPictureTaken(byte[] data, Camera camera) {      // TODO Do something with the image RAW data.    }  };  // stroe the picture in format jpeg  PictureCallback jpegCallback = new PictureCallback() {    public void onPictureTaken(byte[] data, Camera camera) {      // Save the image JPEG data to the SD card      FileOutputStream outStream = null;      try {        //修改圖片路徑和名稱        String tempFilename = String.valueOf(System.currentTimeMillis()) + ".jpg";        File folder = Constants.CACHE_FOLDER;        if (!folder.isDirectory()) {          folder.mkdirs();        }        String path = Constants.CACHE_FOLDER + File.separator + tempFilename;        outStream = new FileOutputStream(path);        outStream.write(data);        outStream.flush();        outStream.close();        surfaceView.setBackgroundDrawable(new BitmapDrawable(BitmapFactory.decodeByteArray(data, 0, data.length)));      } catch (FileNotFoundException e) {        Log.e("TAG", "File Note Found", e);      } catch (IOException e) {        Log.e("TAG", "IO Exception", e);      }    }  };}

classes_activity_takephoto.xml代碼如下：

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:layout_width="match_parent"  android:layout_height="match_parent" >  <SurfaceView    android:id="@+id/surfaceView"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:layout_alignParentLeft="true"    android:layout_toLeftOf="@+id/rlright" />  <LinearLayout    android:id="@+id/rlright"    android:layout_width="40dp"    android:layout_height="match_parent"    android:layout_alignParentRight="true"    android:background="#2b2b2b"    android:gravity="center_horizontal"    android:orientation="vertical" >    <LinearLayout      android:layout_width="wrap_content"      android:layout_height="0dip"      android:layout_weight="1"      android:gravity="center" >      <Button        android:id="@+id/btn_goback"        style="@style/PETextButton"        android:text="返回"/>    </LinearLayout>    <LinearLayout      android:layout_width="wrap_content"      android:layout_height="0dip"      android:layout_weight="1"      android:gravity="center" >      <Button        android:id="@+id/btn_takephoto"        style="@style/PETextButton"        android:text="拍照" />    </LinearLayout>  </LinearLayout></RelativeLayout>

在資訊清單檔需要添加相應許可權：

  <uses-permission android:name="android.permission.CAMERA"/>  <uses-feature android:name="android.hardware.camera"/>  <uses-feature android:name="android.hardware.camera.autofocus"/>

以上就是本文的全部內容，希望對大家的學習有所協助，也希望大家多多支援雲棲社區。