i have for days now try to get my project to work but it didn't, there are similar questions and answers on this site but non help me solve my problem that is why i am asking this question with complete code below.
I am creating a camera project using the Android camera API, and what i want is just to startPreview on a surface for the mean time, but i kept getting a runtime error.
04-10 22:52:28.690: D/com.Server.camerapreview.PreviewActivity(1194): SurfaceChanged: startPreview failed
And my activity xml is
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".PreviewActivity" >
<SurfaceView
android:id="@+id/surfaceView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true" />
</RelativeLayout>
My android Manifest
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.Server.camerapreview"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<uses-permission android:name="android.permission.CAMERA"/>
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.Server.camerapreview.PreviewActivity"
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>
</manifest>
and my main activity is:
package com.Server.camerapreview;
//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.app.Activity;
public class PreviewActivity extends Activity implements SurfaceHolder.Callback{
SurfaceView surfaceView;
SurfaceHolder surfaceHolder;
Camera camera = null;
boolean inPreview = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.preview);
surfaceView = (SurfaceView) findViewById(R.id.surfaceView);
surfaceHolder = surfaceView.getHolder();
surfaceHolder.addCallback(this);
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
camera = Camera.open();
if(camera != null){
try{
camera.setPreviewDisplay(surfaceHolder);
}catch(Exception x){
Log.d(PreviewActivity.class.getName(), "Error in surface created: ["+x.getMessage()+"]");
}
}else Log.d(PreviewActivity.class.getName(), "Camera null");
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
if (surfaceHolder.getSurface() == null){
Log.d(PreviewActivity.class.getName(), "SurfaceHolder is null");
return;
}
if(camera != null && !inPreview){
Camera.Parameters parameters = camera.getParameters();
Camera.Size size = getBestPreviewSize(width, height, parameters);
if (size != null) {
parameters.setPreviewSize(size.width, size.height);
//parameters.setPictureFormat();
// Log.d(PreviewActivity.class.getName(), "size: "+surfaceHolder;
parameters.set("orientation", "portrait");
camera.setParameters(parameters);
try {
camera.setPreviewDisplay(surfaceHolder);
surfaceView.setVisibility(0);
camera.startPreview();
inPreview = true;
} catch (Exception e) {
// TODO Auto-generated catch block
Log.d(PreviewActivity.class.getName(), "SurfaceChanged: "+e.getMessage());
}
}
}else Log.d(PreviewActivity.class.getName(), "Camera null");
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
// TODO Auto-generated method stub
if(inPreview){
camera.stopPreview();
camera.release();
camera = null;
inPreview = false;
}
}
// Getting the best preview size
private Camera.Size getBestPreviewSize(int width, int height, Camera.Parameters parameters) {
Camera.Size result = null;
for (Camera.Size size : parameters.getSupportedPreviewSizes()) {
if (size.width <= width && size.height <= height) {
if (result == null) {
result=size;
}
else {
int resultArea = result.width * result.height;
int newArea = size.width * size.height;
if (newArea > resultArea) {
result = size;
}
}
}
}
return(result);
}
}
