CameraTest.java

最新推荐文章于 2025-12-05 09:24:48 发布

最新推荐文章于 2025-12-05 09:24:48 发布 · 126 阅读

文章标签：

本文介绍了一个简单的Android应用程序，用于实现相机预览功能。该程序通过SurfaceView显示摄像头画面，并使用Camera API进行摄像头操作。同时，文章提供了完整的源代码及配置文件。

package com.lx;

import android.app.Activity;
import android.graphics.PixelFormat;
import android.hardware.Camera;
import android.os.Bundle;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.Window;
import android.view.WindowManager;

public class CameraTest extends Activity implements SurfaceHolder.Callback {

private static final String TAG = "CameraTest";
private SurfaceView mSurfaceView;
private SurfaceHolder mSurfaceHolder;
private Camera mCamera;
private boolean mPreviewRunning;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {

Log.i(TAG, "==============Into onCreate============");
super.onCreate(savedInstanceState);
getWindow().setFormat(PixelFormat.TRANSLUCENT);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.main);
mSurfaceView = (SurfaceView) findViewById(R.id.surface_camera);
mSurfaceHolder = mSurfaceView.getHolder();
mSurfaceHolder.addCallback(this);
mSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}

public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {

if (mPreviewRunning) {
mCamera.stopPreview();
}
Camera.Parameters p = mCamera.getParameters();
p.setPreviewSize(w, h);
Log.i(TAG, "==============Into surfaceChanged============ format "+ p.getPreviewFormat() + " w: "+ w + " h: "+ h);

mCamera.setParameters(p);
try {
mCamera.setPreviewDisplay(holder);
} catch (Exception e) {
e.printStackTrace();
}
mCamera.startPreview();
mPreviewRunning = true;

}

public void surfaceCreated(SurfaceHolder holder) {
Log.i(TAG, "==============Into surfaceCreated============");
mCamera = Camera.open();

}

public void surfaceDestroyed(SurfaceHolder holder) {
Log.i(TAG, "==============Into surfaceDestroyed============");
mCamera.stopPreview();
mPreviewRunning = false;
mCamera.release();

}

Camera.PictureCallback mPictureCallback = new Camera.PictureCallback() {
public void onPictureTaken(byte[] imageData, Camera c) {
Log.i(TAG, "==============Into onPictureTaken============");
}
};

}

------------------------------------------------------

配置文件

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="fill_parent"
android:layout_height="fill_parent">
<SurfaceView android:id="@+id/surface_camera"
android:layout_width="fill_parent" android:layout_height="10dip"
android:layout_weight="1">
</SurfaceView>
</LinearLayout>

-------------------------------------------

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.lx" android:versionCode="1" android:versionName="1.0">
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".CameraTest" android:label="@string/app_name">
<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.CAMERA" />
<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.autofocus" />
<uses-sdk android:minSdkVersion="8" />
</manifest>