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Android实现手机拍照功能

2015-12-11 14:39 896 查看

本文实例为大家讲解如何轻松实现Android手机拍照功能，分享给大家供大家参考。具体如下：

一、布局文件main.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<SurfaceView
android:id="@+id/surfaceView"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />
<RelativeLayout
android:id="@+id/buttonlayout"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:visibility="gone" >
<Button
android:id="@+id/takepicture"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:layout_marginRight="5dp"
android:onClick="takepicture"
android:text="@string/takepicture" />
<Button
android:id="@+id/autofocus"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignTop="@id/takepicture"
android:layout_marginRight="20dp"
android:layout_toLeftOf="@id/takepicture"
android:onClick="takepicture"
android:text="@string/autofocus" />
</RelativeLayout>
</FrameLayout>

二、MainActivity.java

import java.io.File;
import java.io.FileOutputStream;
import android.app.Activity;
import android.hardware.Camera;
import android.hardware.Camera.PictureCallback;
import android.os.Bundle;
import android.os.Environment;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceHolder.Callback;
import android.view.SurfaceView;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.view.WindowManager;
public class MainActivity extends Activity {
private View layout;
private Camera camera;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.main);
layout = this.findViewById(R.id.buttonlayout);
SurfaceView surfaceView = (SurfaceView) this
.findViewById(R.id.surfaceView);
surfaceView.getHolder()
.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
surfaceView.getHolder().setFixedSize(176, 144);
surfaceView.getHolder().setKeepScreenOn(true);
surfaceView.getHolder().addCallback(new SurfaceCallback());
}
public void takepicture(View v) {
if (camera != null) {
switch (v.getId()) {
case R.id.takepicture:
camera.takePicture(null, null, new MyPictureCallback());
break;
case R.id.autofocus:
camera.autoFocus(null);
break;
}
}
}
private final class MyPictureCallback implements PictureCallback {
public void onPictureTaken(byte[] data, Camera camera) {
try {
File jpgFile = new File(
Environment.getExternalStorageDirectory(),
System.currentTimeMillis() + ".jpg");
FileOutputStream outStream = new FileOutputStream(jpgFile);
outStream.write(data);
outStream.close();
camera.startPreview();
} catch (Exception e) {
e.printStackTrace();
}
}
}
private final class SurfaceCallback implements Callback {
public void surfaceCreated(SurfaceHolder holder) {
try {
camera = Camera.open();// 打开摄像头
Camera.Parameters parameters = camera.getParameters();
// Log.i("MainActivity", parameters.flatten());
parameters.setPreviewSize(800, 480);
parameters.setPreviewFrameRate(5);
parameters.setPictureSize(1024, 768);
parameters.setJpegQuality(80);
camera.setParameters(parameters);
camera.setPreviewDisplay(holder);
camera.startPreview();// 开始预览
} catch (Exception e) {
e.printStackTrace();
}
}
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
}
public void surfaceDestroyed(SurfaceHolder holder) {
if (camera != null) {
camera.release();
camera = null;
}
}
}
@Override
public boolean onTouchEvent(MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_DOWN) {
layout.setVisibility(ViewGroup.VISIBLE);
return true;
}
return super.onTouchEvent(event);
}
}

三、添加权限

<uses-permission android:name="android.permission.CAMERA" />
<!-- 在SDCard中创建与删除文件权限 -->
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />
<!-- 往SDCard写入数据权限 -->
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

效果如下：

希望本文所述对大家学习Android软件编程有所帮助。

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标签： Android 拍照

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