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私はAndroidアプリを開発しています。私は 'About'メニューに項目を作成しました。別のページやアクティビティをクリックすると、Dev Name、Contact、Appバージョンのようなテキストを表示します。私はこれを行う方法を知らない、私はこれらの詳細を表示するために乾杯のメッセージを使用しています。助けてください ！Android - メニュー項目にテキストを追加するにはどうすればよいですか？
activity_main.xml
<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=".MainActivity" >
<ImageButton
android:id="@+id/btnSwitch"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_marginTop="100dip"
android:src="@drawable/btn_switch_on"
android:background="@null"
android:contentDescription="@null"
/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/text1"
android:layout_marginTop="10dp"
android:paddingLeft="10dp"
android:lines="2"
android:id="@+id/text2"
android:clickable="true"
android:text="wTorch v1.0"
android:fontFamily="Droid Sans"
android:autoLink="all"
android:typeface="serif"
android:textSize="20sp"
android:gravity="right"
android:textAlignment="gravity" />
</RelativeLayout>
MainActivity.java
package com.wtech.wtorch;
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.os.Handler;
import android.util.Log;
import android.view.View;
import android.widget.ImageButton;
import android.widget.Toast;
import android.view.Menu;
import android.view.MenuItem;
public class MainActivity extends Activity {
private static final Parameters para = null;
private static Camera cam = null;
private static boolean doubleBackToExitPressedOnce = false;
ImageButton btnSwitch;
private Camera camera;
private boolean isFlashOn;
private boolean hasFlash;
Parameters params;
MediaPlayer mp;
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.about:
Toast.makeText(getApplicationContext()," App Version - 1.0 \n Developer - Mohammad Waris Ansari \n Contact - [email protected]",Toast.LENGTH_LONG).show();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
@Override
public void onBackPressed() {
if (doubleBackToExitPressedOnce) {
super.onBackPressed();
return;
}
this.doubleBackToExitPressedOnce = true;
Toast.makeText(this, "Press again to exit", Toast.LENGTH_SHORT).show();
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
doubleBackToExitPressedOnce=false;
}
}, 2000);
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnSwitch = (ImageButton) findViewById(R.id.btnSwitch);
hasFlash = getApplicationContext().getPackageManager()
.hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH);
if (!hasFlash) {
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;
}
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;
}
params = camera.getParameters();
params.setFlashMode(Parameters.FLASH_MODE_OFF);
camera.setParameters(params);
camera.stopPreview();
isFlashOn = false;
// changing button/switch image
toggleButtonImage();
}
}
/*
* 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();
turnOffFlash();
}
@Override
protected void onRestart() {
super.onRestart();
}
@Override
protected void onResume() {
super.onResume();
if(hasFlash)
turnOnFlash();
}
@Override
protected void onStart() {
super.onStart();
getCamera();
}
@Override
protected void onStop() {
super.onStop();
if (camera != null) {
camera.release();
camera = null;
}
}
}
menu_main.xml
は別々の活動を作成し、あなたも –