在手机上面实现，设置一段时间（以秒计时）之后，自动拍照，适用于摄影师建立一个场景，之后设置时间，再进入场景。
界面主要就是一个设置时间的EditText和启动倒计时的Button，设置完时间之后，点击倒计时按钮。
代码语言：javascript复制<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@ id/frameLayout"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
<SurfaceView
android:id="@ id/imageView"
android:layout_width="fill_parent"
android:layout_height="fill_parent" /
<LinearLayout
android:id="@ id/lineLayout"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
<Button
android:id="@ id/startBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/startTimer"
android:layout_gravity="center_horizontal"/
<!-- <TextView --
<!-- android:id="@ id/countDowntextView" --
<!-- android:layout_width="fill_parent" --
<!-- android:layout_height="fill_parent" --
<!-- android:layout_gravity="center_horizontal|center_vertical|center" --
<!-- android:gravity="center_horizontal|center_vertical" --
<!-- android:text="@string/conutTime" --
<!-- android:textSize="40sp" / --
<EditText
android:id="@ id/countDownEditTextView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_gravity="center_horizontal|center_vertical|center"
android:gravity="center_horizontal|center_vertical"
android:text="@string/conutTime"
android:textSize="80sp"
android:inputType="number"/
</LinearLayout
</FrameLayout 在清单文件中加入权限：
代码语言：javascript复制<uses-permission android:name="android.permission.CAMERA" /
<!--下面的可不需要--
<uses-feature android:name="android.hardware.camera" /
<uses-feature android:name="android.hardware.camera.autofocus" / 主程序：
代码语言：javascript复制package cn.yh.cameradelaycontroll;
import java.io.OutputStream;
import java.util.Iterator;
import java.util.List;
import android.app.Activity;
import android.content.ContentValues;
import android.content.res.Configuration;
import android.hardware.Camera;
import android.hardware.Camera.PictureCallback;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.provider.MediaStore.Images.Media;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.Log;
import android.view.Menu;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends Activity implements SurfaceHolder.Callback,
OnClickListener, PictureCallback {
private static final String CAMERA_CONTROLL = "CAMERA_CONTROLL";
private SurfaceView imageSView;
private Button startButton;
// private TextView countDownTextView;
private EditText countDownEditTextView;
private Camera camera;
private SurfaceHolder surfaceHolder;
private Handler timerUpdateHandler;
private boolean timerRunning = false;
private int currentTimer = 10;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
imageSView = (SurfaceView) findViewById(R.id.imageView);
startButton = (Button) findViewById(R.id.startBtn);
// countDownTextView = (TextView) findViewById(R.id.countDowntextView);
countDownEditTextView = (EditText) findViewById(R.id.countDownEditTextView);
/*
countDownEditTextView.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence s, int start, int before,
int count) {
// TODO Auto-generated method stub
}
@Override
public void beforeTextChanged(CharSequence arg0, int arg1,
int arg2, int arg3) {
// TODO Auto-generated method stub
}
@Override
public void afterTextChanged(Editable arg0) {
// TODO Auto-generated method stub
currentTimer = Integer.parseInt(countDownEditTextView.getText().toString());
}
});
*/
surfaceHolder = imageSView.getHolder();
surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
surfaceHolder.addCallback(this);
startButton.setOnClickListener(this);
timerUpdateHandler = new Handler();
}
@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;
}
@Override
public void onPictureTaken(byte[] data, Camera camera) {
// TODO Auto-generated method stub
Uri imageFileUri = getContentResolver().insert(
Media.EXTERNAL_CONTENT_URI, new ContentValues());
try {
OutputStream imageFileOS = getContentResolver().openOutputStream(
imageFileUri);
imageFileOS.write(data);
imageFileOS.flush();
imageFileOS.close();
} catch (Exception e) {
// TODO Auto-generated catch block
Toast.makeText(this, e.getMessage(), Toast.LENGTH_LONG).show();
}
camera.startPreview();
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
currentTimer = Integer.parseInt(countDownEditTextView.getText().toString());
switch (v.getId()) {
case R.id.startBtn:
if (!timerRunning) {
timerRunning = true;
timerUpdateHandler.post(timerUpdateTask);
}
break;
}
}
private Runnable timerUpdateTask = new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
if (currentTimer 1) {
currentTimer--;
timerUpdateHandler.postDelayed(timerUpdateTask, 1000);
} else {
camera.takePicture(null, null, null, MainActivity.this);
timerRunning = false;
currentTimer = 10;
}
countDownEditTextView.setText(currentTimer "");
}
};
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
// TODO Auto-generated method stub
camera.startPreview();
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
// TODO Auto-generated method stub
int cameraNums = Camera.getNumberOfCameras();
Log.e(CAMERA_CONTROLL, cameraNums "");
try {
camera = Camera.open(cameraNums - 1);
} catch (Exception e) {
Log.e(CAMERA_CONTROLL, e.getMessage());
}
try {
camera.setPreviewDisplay(holder);
Camera.Parameters parameters = camera.getParameters();
if (this.getResources().getConfiguration().orientation != Configuration.ORIENTATION_LANDSCAPE) {
parameters.set("orientation", "portrait");
camera.setDisplayOrientation(90);
parameters.setRotation(90);
}
List<String colorEffects = parameters.getSupportedColorEffects();
Iterator<String cei = colorEffects.iterator();
while (cei.hasNext()) {
String currentEffect = cei.next();
if (currentEffect.equals(Camera.Parameters.EFFECT_SOLARIZE)) {
parameters
.setColorEffect(Camera.Parameters.EFFECT_SOLARIZE);
break;
}
}
camera.setParameters(parameters);
} catch (Exception e) {
// TODO Auto-generated catch block
// e.printStackTrace();
camera.release();
}
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
// TODO Auto-generated method stub
camera.stopPreview();
camera.release();
}
} 以上就是本文的全部内容，希望对大家的学习有所帮助。
