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android手电筒在galaxy nexus上崩溃

转载 作者:行者123 更新时间:2023-11-30 02:43:45 25 4
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大家好,我已经为 Android 开发了这款手电筒应用程序。程序首先检查设备是否支持手电筒;如果不是,它将通过错误消息通知。我已经在 nexus 4(android 4.4)上启动它并且它工作正常但是在我的 galaxy nexus(android 4.3)上手电筒没有打开并且没有显示错误消息

这是代码:

package com.androidhive.flashlight;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.pm.PackageManager;
import android.hardware.Camera;
import android.hardware.Camera.Parameters;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnCompletionListener;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ImageButton;

public class MainActivity extends Activity {

ImageButton btnSwitch;

private Camera camera;
private boolean isFlashOn;
private boolean hasFlash;
Parameters params;
MediaPlayer mp;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

// flash switch button
btnSwitch = (ImageButton) findViewById(R.id.btnSwitch);

/*
* First check if device is supporting flashlight or not
*/
hasFlash = getApplicationContext().getPackageManager()
.hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH);

if (!hasFlash) {
// device doesn't support flash
// Show alert message and close the application
AlertDialog alert = new AlertDialog.Builder(MainActivity.this)
.create();
alert.setTitle("Error");
alert.setMessage("Sorry, your device doesn't support flash light!");
alert.setButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// closing the application
finish();
}
});
alert.show();
return;
}

// get the camera
getCamera();

// displaying button image
toggleButtonImage();

/*
* Switch button click event to toggle flash on/off
*/
btnSwitch.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View v) {
if (isFlashOn) {
// turn off flash
turnOffFlash();
} else {
// turn on flash
turnOnFlash();
}
}
});
}

/*
* Get the camera
*/
private void getCamera() {
if (camera == null) {
try {
camera = Camera.open();
params = camera.getParameters();
} catch (RuntimeException e) {
Log.e("Camera Error. Failed to Open. Error: ", e.getMessage());
}
}
}

/*
* Turning On flash
*/
private void turnOnFlash() {
if (!isFlashOn) {
if (camera == null || params == null) {
return;
}
// play sound
playSound();

params = camera.getParameters();
params.setFlashMode(Parameters.FLASH_MODE_TORCH);
camera.setParameters(params);
camera.startPreview();
isFlashOn = true;

// changing button/switch image
toggleButtonImage();
}

}

/*
* Turning Off flash
*/
private void turnOffFlash() {
if (isFlashOn) {
if (camera == null || params == null) {
return;
}
// play sound
playSound();

params = camera.getParameters();
params.setFlashMode(Parameters.FLASH_MODE_OFF);
camera.setParameters(params);
camera.stopPreview();
isFlashOn = false;

// changing button/switch image
toggleButtonImage();
}
}

/*
* Playing sound
* will play button toggle sound on flash on / off
* */
private void playSound(){
if(isFlashOn){
mp = MediaPlayer.create(MainActivity.this, R.raw.light_switch_off);
}else{
mp = MediaPlayer.create(MainActivity.this, R.raw.light_switch_on);
}
mp.setOnCompletionListener(new OnCompletionListener() {

@Override
public void onCompletion(MediaPlayer mp) {
// TODO Auto-generated method stub
mp.release();
}
});
mp.start();
}

/*
* Toggle switch button images
* changing image states to on / off
* */
private void toggleButtonImage(){
if(isFlashOn){
btnSwitch.setImageResource(R.drawable.btn_switch_on);
}else{
btnSwitch.setImageResource(R.drawable.btn_switch_off);
}
}

@Override
protected void onDestroy() {
super.onDestroy();
}

@Override
protected void onPause() {
super.onPause();

// on pause turn off the flash
turnOffFlash();
}

@Override
protected void onRestart() {
super.onRestart();
}

@Override
protected void onResume() {
super.onResume();

// on resume turn on the flash
if(hasFlash)
turnOnFlash();
}

@Override
protected void onStart() {
super.onStart();

// on starting the app get the camera params
getCamera();
}

@Override
protected void onStop() {
super.onStop();

// on stop release the camera
if (camera != null) {
camera.release();
camera = null;
}
}

}

这是 androidmanifest.xml:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.androidhive.flashlight"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />

<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera" />

<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.androidhive.flashlight.MainActivity"
android:label="@string/app_name"
android:screenOrientation="portrait">
<intent-filter>
<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>

</manifest>

有人能告诉我为什么它不能在 galaxy nexus 上运行吗?谢谢

最佳答案

首先添加以下权限:

<!-- Allows access to the flashlight -->
<permission android:name="android.permission.FLASHLIGHT"
android:permissionGroup="android.permission-group.HARDWARE_CONTROLS"
android:protectionLevel="normal"
android:label="@string/permlab_flashlight"
android:description="@string/permdesc_flashlight" />

同样对于 galaxy nexu,您需要使用大小为 1dpx1dp 的 SurfaceView 来打开手电筒。您还需要实现 SurfaceHolder.Callback。

查看 this question .

关于android手电筒在galaxy nexus上崩溃,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/25386550/

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