特别针对三星盖世相机：EK-GC100  EK-GC110

MainActivity.java

package com.example.mytestcamera;

import java.io.IOException;

import android.app.Activity;

import android.hardware.Camera;

import android.hardware.Camera.Parameters;

import android.os.Bundle;

import android.util.Log;

import android.view.KeyEvent;

import android.view.SurfaceHolder;

import android.view.SurfaceView;

import android.view.View;

import android.widget.Button;

public class MainActivity extends Activity implements SurfaceHolder.Callback{

@Override

public boolean onKeyDown(int keyCode, KeyEvent event) {

// TODO Auto-generated method stub

if (isPreview) {

switch (keyCode) {

case KeyEvent.KEYCODE_ZOOM_IN:

Log.i("ZOOM", "放大");

setZoom1();

break;

case KeyEvent.KEYCODE_ZOOM_OUT:

Log.i("ZOOM", "缩小");

setZoom2();

break;

default:

break;

}

}

return super.onKeyDown(keyCode, event);

}

public Camera myCamera;

SurfaceView mySurfaceView;

SurfaceHolder mySurfaceHolder;

Button myButton1;

Button myButton2;

boolean isPreview = false;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

//this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);

setContentView(R.layout.activity_main);

mySurfaceView = (SurfaceView)findViewById(R.id.mySurfaceView);

myButton1 = (Button)findViewById(R.id.myButton);

myButton2 = (Button)findViewById(R.id.myButton2);

mySurfaceHolder = mySurfaceView.getHolder();

mySurfaceHolder.addCallback(this);

mySurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

myButton1.setOnClickListener(new Button.OnClickListener(){

@Override

public void onClick(View v) {

initCamera();

}

});

myButton2.setOnClickListener(new Button.OnClickListener(){

@Override

public void onClick(View v) {

if(myCamera!=null&&isPreview){

myCamera.stopPreview();

myCamera.release();

myCamera = null;

isPreview = false;

}

}

});

}

public void initCamera() {

// TODO Auto-generated method stub

Log.i("ZOOM", "initCamera");

if(!isPreview){

myCamera = Camera.open();

}

if(myCamera !=null && !isPreview){

try{

myCamera.setPreviewDisplay(mySurfaceHolder);

myCamera.startPreview();

}

catch(IOException e){

e.printStackTrace();

}

isPreview = true;

}

}

@Override

public void surfaceChanged(SurfaceHolder holder, int format, int width,

int height) {

// TODO Auto-generated method stub

}

@Override

public void surfaceCreated(SurfaceHolder holder) {

// TODO Auto-generated method stub

}

@Override

public void surfaceDestroyed(SurfaceHolder holder) {

// TODO Auto-generated method stub

}

public boolean isSupportZoom()

{

boolean isSuppport = false;

if (myCamera.getParameters().isZoomSupported())//myCamera.getParameters().isSmoothZoomSupported())

{

isSuppport = true;

}

return isSuppport;

}

public void setZoom1()

{

if (isSupportZoom())

{

try

{

Parameters params = myCamera.getParameters();

final int MAX = params.getMaxZoom();

int zoomValue = params.getZoom();

Log.i("ZOOM", "-----------------MAX:"+MAX+" params : "+zoomValue);

if (zoomValue <= 14) {

zoomValue += 1;

params.setZoom(zoomValue);

myCamera.setParameters(params);

}

Log.i("ZOOM", "Is support Zoom " + params.isZoomSupported());

}

catch (Exception e)

{

Log.i("ZOOM", "--------exception zoom");

e.printStackTrace();

}

}

else

{

Log.i("ZOOM", "--------the phone not support zoom");

}

}

public void setZoom2()

{

if (isSupportZoom())

{

try

{

Parameters params = myCamera.getParameters();

final int MAX = params.getMaxZoom();

int zoomValue = params.getZoom();

Log.i("ZOOM", "-----------------MAX:"+MAX+" params : "+zoomValue);

if (zoomValue >= 1) {

zoomValue -= 1;

params.setZoom(zoomValue);

myCamera.setParameters(params);

}

Log.i("ZOOM", "Is support Zoom " + params.isZoomSupported());

}

catch (Exception e)

{

Log.i("ZOOM", "--------exception zoom");

e.printStackTrace();

}

}

else

{

Log.i("ZOOM", "--------the phone not support zoom");

}

}

}

activity_main.xml

android:orientation="vertical"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

>

android:id="@+id/mySurfaceView"

android:layout_width="match_parent"

android:layout_height="418dp" >

android:layout_width="fill_parent"

android:layout_height="wrap_content"

>

android:id="@+id/myButton"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="打开"/>

android:id="@+id/myButton2"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="关闭" />

注意加上权限：

@Override

public boolean onKeyDown(int keyCode, KeyEvent event) {

// TODO Auto-generated method stub

switch (keyCode) {

case KeyEvent.KEYCODE_ZOOM_IN:

Log.i("ZOOM", "放大");

setZoom(1);

break;

case KeyEvent.KEYCODE_ZOOM_OUT:

Log.i("ZOOM", "缩小");

setZoom(2);

break;

default:

break;

}

return super.onKeyDown(keyCode, event);

}

public void setZoom(int zoomKey){

//判断是否支持变焦

if (mCamera.getParameters().isZoomSupported()) {

try {

Parameters parameters = mCamera.getParameters();

int zoomValue = parameters.getZoom();

switch (zoomKey) {

case 1:

if (zoomValue <= 14)

zoomValue += 1;

break;

case 2:

if (zoomValue >= 1)

zoomValue -= 1;

break;

default:

break;

}

parameters.setZoom(zoomKey);

mCamera.setParameters(parameters);

} catch (Exception e) {

Log.i("ZOOM", "exception zoom");

e.printStackTrace();

}

}else {

Log.i("ZOOM", "NOT support zoom");

}

}