手机拍照功能的简单实现
1、main.xml
<?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="fill_parent" android:layout_height="fill_parent" /> <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_alignParentRight="true" android:orientation="horizontal" > <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="对焦" android:onClick="focus" android:layout_marginRight="10dp" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="拍照" android:onClick="takepicture" android:layout_marginRight="10dp" /> </LinearLayout> </RelativeLayout>
2、MainActivity
package com.njupt.takepicture1; import java.io.File; import java.io.FileOutputStream; import android.hardware.Camera; import android.hardware.Camera.Parameters; import android.hardware.Camera.PictureCallback; import android.os.Bundle; import android.os.Environment; import android.app.Activity; import android.view.Menu; import android.view.SurfaceHolder; import android.view.SurfaceHolder.Callback; import android.view.SurfaceView; import android.view.View; import android.view.Window; import android.view.WindowManager; public class MainActivity extends Activity { private SurfaceView surfaceview; private Camera camera; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.main); getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); surfaceview = (SurfaceView) findViewById(R.id.surfaceview); SurfaceHolder holder = surfaceview.getHolder(); holder.setFixedSize(176, 144); holder.setKeepScreenOn(true); holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); holder.addCallback(new MySurfaceCallback()); } private class MySurfaceCallback implements Callback { @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { // TODO Auto-generated method stub } @Override public void surfaceCreated(SurfaceHolder holder) { try { camera = Camera.open(); Parameters params = camera.getParameters(); params.setJpegQuality(90); params.setPictureSize(1024, 768); params.setPreviewFrameRate(10); camera.setParameters(params); camera.setPreviewDisplay(surfaceview.getHolder()); camera.startPreview(); } catch (Exception e) { e.printStackTrace(); } } @Override public void surfaceDestroyed(SurfaceHolder holder) { if (camera != null) { camera.release(); camera = null; } } } public void takepicture(View v) { camera.takePicture(null, null, new MyPictureCallback()); } private class MyPictureCallback implements PictureCallback { @Override public void onPictureTaken(byte[] data, Camera camera) { try { File file = new File(Environment.getExternalStorageDirectory(), System.currentTimeMillis() + ".jpg"); FileOutputStream fos = new FileOutputStream(file); fos.write(data); camera.startPreview(); } catch (Exception e) { e.printStackTrace(); } } } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } }
3、AndroidManifest.xml
注册权限
<uses-permission android:name="android.permission.CAMERA"/> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>
横屏显示:
<activity android:name="com.njupt.takepicture1.MainActivity" android:label="@string/app_name" android:screenOrientation="landscape">