我对Android和java编程有点新，我喜欢它，我已经制作了一个手电筒应用程序，我想添加频闪仪，我看到了一些教程，但我有点搞砸了，请对我温柔:)），所以这里是我的代码，而且我还有一个没用的代码，一个用于频闪仪的代码，它不完整！
这是AndroidManifest.XML文件
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.mihai_bucur.lanternuta">
<uses-permission android:name="android.permission.CAMERA"/>;
<uses-feature android:name="android.hardware.camera"/>;
<uses-permission android:name="android.permission.FLASHLIGHT"/>
<uses-permission android:name="android.permission.WAKE_LOCK"/>
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity"
android:screenOrientation="portrait">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity><!-- ATTENTION: This was auto-generated to add Google Play services to your project for
App Indexing. See https://g.co/AppIndexing/AndroidStudio for more information. -->
<meta-data
android:name="com.google.android.gms.version"
android:value="@integer/google_play_services_version" />
</application>
现在这是MainActivity.java
package com.mihai_bucur.lanternuta;
import android.annotation.SuppressLint;
import android.annotation.TargetApi;
import android.app.Activity;
import android.app.Fragment;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ImageButton;
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.widget.SeekBar;
import com.google.android.gms.appindexing.Action;
import com.google.android.gms.appindexing.AppIndex;
import com.google.android.gms.common.api.GoogleApiClient;
import java.security.Policy;
@SuppressWarnings("deprecation")
public class MainActivity extends Activity {
ImageButton btnSwitch;
private Camera camera;
private boolean isFlashOn;
private boolean hasFlash;
Parameters params;
MediaPlayer mp;
int freq;
int sr;
/**
* ATTENTION: This was auto-generated to implement the App Indexing API.
* See https://g.co/AppIndexing/AndroidStudio for more information.
*/
private GoogleApiClient client;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//butonul pentru aprindere flash
btnSwitch = (ImageButton) findViewById(R.id.btnSwitch);
/*
//verificam intai daca are sau nu Bliț
*/
hasFlash = getApplicationContext().getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH);
if (!hasFlash) {
// dacă device-ul nu are blit
// Arata un mesaj de eroare si inchide aplicatia
AlertDialog alert = new AlertDialog.Builder(MainActivity.this)
.create();
alert.setTitle("Eroare");
alert.setMessage("Imi pare rău, device-ul tău nu are bliț!");
alert.setButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// closing the application
finish();
}
});
alert.show();
return;
}
btnSwitch.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (isFlashOn) {
//opreset blit
turnOffFlash();
} else {
//porneste blit
turnOnFlash();
}
}
});
// ATTENTION: This was auto-generated to implement the App Indexing API.
// See https://g.co/AppIndexing/AndroidStudio for more information.
client = new GoogleApiClient.Builder(this).addApi(AppIndex.API).build();
}
// cauta parametrii camera
@SuppressLint("LongLogTag")
private void getCamera() {
if (camera == null) {
try {
camera = Camera.open();
params = camera.getParameters();
} catch (RuntimeException e) {
Log.e("Eroare Cameră.Nu s-a putut deschide. Error: ", e.getMessage());
}
}
}
/*
Pornesc Blit-ul
*/
private void turnOnFlash() {
if (!isFlashOn) {
if (camera == null || params == null & freq != 0) {
return;
}
//sunet
playSound();
params = camera.getParameters();
params.setFlashMode(Parameters.FLASH_MODE_TORCH);
camera.setParameters(params);
camera.startPreview();
isFlashOn = true;
//schimba imaginea butonului
toggleButtonImage();
}
}
/*
* Sunet
* se va auzi cand se schimba de pe on pe off si invers
* */
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 MediaPlayer.OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mp) {
// TODO Auto-generated method stub
mp.release();
}
});
mp.start();
}
/*
Opresc Blit-ul
*/
private final void turnOffFlash() {
if (isFlashOn) {
return;
}
// sunet
playSound();
params = camera.getParameters();
params.setFlashMode(Parameters.FLASH_MODE_OFF);
camera.setParameters(params);
camera.stopPreview();
isFlashOn = false;
// scimba imaginea butonului
toggleButtonImage();
}
//ia imaginile si le schimba pentru fiecare state , on sau 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();
// cand este in pauza aplicatie opreste blit
turnOffFlash();
}
@Override
protected void onRestart() {
super.onRestart();
}
@Override
protected void onResume() {
super.onResume();
// la revenire porneste blitul
if (hasFlash)
turnOnFlash();
}
@Override
protected void onStart() {
super.onStart();
// ATTENTION: This was auto-generated to implement the App Indexing API.
// See https://g.co/AppIndexing/AndroidStudio for more information.
client.connect();
// la pornirea aplicatiei ia parametrii device-ului
getCamera();
// ATTENTION: This was auto-generated to implement the App Indexing API.
// See https://g.co/AppIndexing/AndroidStudio for more information.
Action viewAction = Action.newAction(
Action.TYPE_VIEW, // TODO: choose an action type.
"Main Page", // TODO: Define a title for the content shown.
// TODO: If you have web page content that matches this app activity's content,
// make sure this auto-generated web page URL is correct.
// Otherwise, set the URL to null.
Uri.parse("http://host/path"),
// TODO: Make sure this auto-generated app URL is correct.
Uri.parse("android-app://com.mihai_bucur.lanternuta/http/host/path")
);
AppIndex.AppIndexApi.start(client, viewAction);
}
@Override
protected void onStop() {
super.onStop();
// ATTENTION: This was auto-generated to implement the App Indexing API.
// See https://g.co/AppIndexing/AndroidStudio for more information.
Action viewAction = Action.newAction(
Action.TYPE_VIEW, // TODO: choose an action type.
"Main Page", // TODO: Define a title for the content shown.
// TODO: If you have web page content that matches this app activity's content,
// make sure this auto-generated web page URL is correct.
// Otherwise, set the URL to null.
Uri.parse("http://host/path"),
// TODO: Make sure this auto-generated app URL is correct.
Uri.parse("android-app://com.mihai_bucur.lanternuta/http/host/path")
);
AppIndex.AppIndexApi.end(client, viewAction);
// la oprire nu te mai folosi de camera
if (camera != null) {
camera.release();
camera = null;
}
// ATTENTION: This was auto-generated to implement the App Indexing API.
// See https://g.co/AppIndexing/AndroidStudio for more information.
client.disconnect();
}
}
我知道我是一个小新手，但我想学习，希望你能给我一个答案。
P.S：在我尝试添加频闪之前，它已经运行了，现在它在模拟器上崩溃了。
P.S 2：我不打算在商店推出应用程序，它只适合我，只是为了学习
谢谢！