Hello,
I am creating Flashlight Android App..and facing below problem..Please guide me
...
*when i press button in potrait mode Flash light is goes on and when I rotate
to landscape mode flash light goes off..*
Code is below -
package com.example.admin.finalflash;
import android.content.DialogInterface;
import android.content.pm.PackageManager;
import android.hardware.Camera;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageButton;
public class MainActivity extends AppCompatActivity {
ImageButton imagebuttonon, imagebuttonoff;
public static Camera cmr;
Camera.Parameters parameters;
boolean isFlash = false;
boolean isOn = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
imagebuttonoff = (ImageButton) findViewById(R.id.imagebuttonoff);
if
(getApplicationContext().getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH))
{
cmr = Camera.open();
parameters = cmr.getParameters();
isFlash = true;
}
//setting onclicklistner on off ie red imagebutton..
imagebuttonoff.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (isFlash)
// if your mobile support flash light
{
//if flash light is not on
if (!isOn) {
imagebuttonoff.setImageResource(R.drawable.onswitch);
//replace offswitch image with onswitch image.
parameters.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);//also set on flash
torch parameter..
cmr.setParameters(parameters);//by using object cmr.
cmr.startPreview();
isOn = true;// now flashlight is on..ie true
} else {
//exactly opposite as above ie as switch on..ie how to off flash light..
imagebuttonoff.setImageResource(R.drawable.offswitch);
parameters.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);
cmr.setParameters(parameters);
cmr.stopPreview();
isOn = false; // now flash light is off..
}
} else { // if your mobile does not support flash light..
AlertDialog.Builder builder = new
AlertDialog.Builder(MainActivity.this);
builder.setTitle("Error"); // this will set title for error
message...
builder.setMessage("Flash light not available"); // will
display message
builder.setPositiveButton("ok", new
DialogInterface.OnClickListener() {//so that you can click on "ok"..
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss(); // so application is dismiss
finish();
}
});
AlertDialog alertDialog = builder.create(); //this will
shows dialog box..which is showing above error message..
alertDialog.show();
}
}
});
}
@Override
protected void onDestroy() {
super.onDestroy();
}
@Override
protected void onPause() {
super.onPause();
// on pause turn off the flash
cmr.stopPreview();
}
@Override
protected void onRestart() {
super.onRestart();
}
@Override
protected void onResume() {
super.onResume();
// on resume turn on the flash
if (isOn)
cmr.startPreview();
}
@Override
protected void onStart() {
super.onStart();
// on starting the app get the camera params
cmr.startPreview();
}
@Override
protected void onStop() { // this will stop out flash light..
super.onStop();
if (cmr != null)
cmr.release();
cmr = null;
}
@Override
protected void onSaveInstanceState(Bundle outState) {
//outState.getBoolean("mode", false);
super.onSaveInstanceState(outState);
outState.putBoolean("mode", isOn);
}
@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
super.onRestoreInstanceState(savedInstanceState);
isOn = savedInstanceState.getBoolean("mode");
}
}
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