Is there any reason for an application that uses Shared Preferences to work on only a few phones?
Yes, the reason for the particular application to stop working on some phones is Shared Preferences. If I leave the sharedpreferences annotated as an annotation, the application starts normally:
MainActivity class:
package com.aeffy.imagker;
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.graphics.Typeface;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.view.WindowManager;
import android.widget.TextView;
import java.io.File;
public class MainActivity extends AppCompatActivity {
private static final int CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE = 1;
String imageName = "IMG_COLOR_PICKER_LIVE";
TextView takePhoto, title, help;
@Override
protected void onCreate(Bundle savedInstanceState) {
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Typeface awesome = Typeface.createFromAsset(getAssets(), "fonts/fontawesome.ttf");
Typeface viga = Typeface.createFromAsset(getAssets(), "fonts/Viga.ttf");
Typeface title = Typeface.createFromAsset(getAssets(), "fonts/KaushanScript-Regular.ttf");
this.takePhoto = (TextView) findViewById(R.id.takePhoto);
this.title = (TextView) findViewById(R.id.title);
this.help = (TextView) findViewById(R.id.help);
this.help.setTypeface(viga);
this.takePhoto.setTypeface(awesome);
this.title.setTypeface(title);
this.takePhoto.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
File file = getFile();
intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(file));
startActivityForResult(intent, CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE);
}
});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE && resultCode == RESULT_OK) {
String path = "sdcard/temp_hexify/" + imageName + ".png";
Intent imageActivity = new Intent(MainActivity.this, ImageActivity.class);
imageActivity.putExtra("path", path);
startActivity(imageActivity);
}
}
public File getFile(){
File folder = new File("sdcard/temp_hexify");
if (!folder.exists()){
folder.mkdir();
}
File image = new File(folder, imageName + ".png");
return image;
}
}
ImageActivity class:
package com.aeffy.imagker;
import android.content.Intent;
import android.content.SharedPreferences;
import android.graphics.Bitmap;
import android.graphics.Color;
import android.graphics.Matrix;
import android.graphics.Typeface;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.MotionEvent;
import android.view.View;
import android.view.WindowManager;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.Map;
public class ImageActivity extends AppCompatActivity {
ImageView image;
TextView preview, hex, back, save, historic, trash;
SharedPreferences settings;
Spinner spinner;
ArrayList<String> codes;
Toast toast = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_image);
Typeface awesome = Typeface.createFromAsset(getAssets(), "fonts/fontawesome.ttf");
Typeface viga = Typeface.createFromAsset(getAssets(), "fonts/Viga.ttf");
this.image = (ImageView) findViewById(R.id.image);
this.preview = (TextView) findViewById(R.id.color);
this.hex = (TextView) findViewById(R.id.hex);
this.back = (TextView) findViewById(R.id.back);
this.save = (TextView) findViewById(R.id.save);
this.spinner = (Spinner) findViewById(R.id.spinner);
this.historic = (TextView) findViewById(R.id.historic);
this.trash = (TextView) findViewById(R.id.trash);
this.preview.setTypeface(awesome);
this.back.setTypeface(awesome);
this.trash.setTypeface(awesome);
this.save.setTypeface(awesome);
this.historic.setTypeface(awesome);
this.hex.setTypeface(viga);
String appname = getResources().getString(R.string.app_name);
settings = getSharedPreferences(appname, MODE_PRIVATE);
codes = new ArrayList<String>();
this.save.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String currentColorCode = hex.getText().toString();
String message = getResources().getString(R.string.saved) + " " + currentColorCode;
if (toast != null) {
toast.cancel();
}
toast = Toast.makeText(ImageActivity.this, message, Toast.LENGTH_LONG);
toast.show();
SharedPreferences.Editor editor = settings.edit();
editor.putString("CODE" + currentColorCode, currentColorCode);
editor.commit();
}
});
this.trash.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
codes.clear();
SharedPreferences.Editor editor = settings.edit();
editor.clear();
editor.commit();
String message = getResources().getString(R.string.cleaned);
if (toast != null) {
toast.cancel();
}
toast = Toast.makeText(ImageActivity.this, message, Toast.LENGTH_LONG);
toast.show();
}
});
this.historic.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Map<String, ?> keys = settings.getAll();
for (Map.Entry<String, ?> entry : keys.entrySet()) {
codes.add(entry.getValue().toString());
}
if (codes.size() > 0) {
ArrayAdapter<String> adapter = new ArrayAdapter<String>(
ImageActivity.this, android.R.layout.simple_spinner_dropdown_item, codes);
spinner.setAdapter(adapter);
spinner.performClick();
} else {
String message = getResources().getString(R.string.empty);
if (toast != null) {
toast.cancel();
}
toast = Toast.makeText(ImageActivity.this, message, Toast.LENGTH_LONG);
toast.show();
}
}
});
this.back.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startActivity(new Intent(ImageActivity.this, MainActivity.class));
finish();
}
});
Intent intent = getIntent();
String path = intent.getExtras().getString("path");
this.image.setImageDrawable(Drawable.createFromPath(path));
this.hex.setText("#ffffff".toUpperCase());
this.image.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
float eventX = event.getX();
float eventY = event.getY();
float[] eventXY = new float[]{eventX, eventY};
Matrix invertMatrix = new Matrix();
image.getImageMatrix().invert(invertMatrix);
invertMatrix.mapPoints(eventXY);
int x = Integer.valueOf((int) eventXY[0]);
int y = Integer.valueOf((int) eventXY[1]);
try {
Drawable drawable = image.getDrawable();
Bitmap bitmap = ((BitmapDrawable) drawable).getBitmap();
int intColor = bitmap.getPixel(x, y);
String color = String.format("#%06X", (0xFFFFFF & intColor));
preview.setTextColor(Color.parseColor(color));
hex.setText(color);
} catch (IllegalArgumentException e) {
e.printStackTrace();
}
return true;
}
});
}
}