I'd like to to make possible that layout with options to change the background color of MainActivity. I don't know how to do this- how tell the program to change the background color of other view, in this case: View v from MainActivity. Also, there is this error on "android.view.View.setBacktroundColor(int)" in the SettingsActivity
MainActivity.java:
package com.example.nowy;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ToggleButton;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final Button buttonOptions = (Button) findViewById(R.id.buttonOptions);
buttonOptions.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Intent optionsIntent = new Intent(MainActivity.this,
SettingsActivity.class);
// Use the Intent to start the HelloAndroid Activity
startActivity(optionsIntent);
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
SettingsActivity.java:
package com.example.nowy;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.SeekBar;
public class SettingsActivity extends Activity {
SeekBar seekRed, seekGreen, seekBlue, seekAlpha;
View targetView;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.mainlayout);
targetView = (View)findViewById(R.id.textView1);
seekRed = (SeekBar)findViewById(R.id.seekred);
seekGreen = (SeekBar)findViewById(R.id.seekgreen);
seekBlue = (SeekBar)findViewById(R.id.seekblue);
seekAlpha = (SeekBar)findViewById(R.id.seekalpha);
seekRed.setOnSeekBarChangeListener(seekChangeListener);
seekGreen.setOnSeekBarChangeListener(seekChangeListener);
seekBlue.setOnSeekBarChangeListener(seekChangeListener);
seekAlpha.setOnSeekBarChangeListener(seekChangeListener);
}
private SeekBar.OnSeekBarChangeListener seekChangeListener
= new SeekBar.OnSeekBarChangeListener(){
@Override
public void onProgressChanged(SeekBar arg0, int arg1, boolean arg2) {
// TODO Auto-generated method stub
updateBackgroundColor();
}
@Override
public void onStartTrackingTouch(SeekBar arg0) {
// TODO Auto-generated method stub
}
@Override
public void onStopTrackingTouch(SeekBar arg0) {
// TODO Auto-generated method stub
}};
private void updateBackgroundColor(){
int red = seekRed.getProgress();
int green = seekGreen.getProgress();
int blue = seekBlue.getProgress();
int alpha = seekAlpha.getProgress();
targetView.setBackgroundColor(
((alpha << 24) & 0xFF000000)
+ ((red << 16) & 0x00FF0000)
+ ((green << 8) & 0x0000FF00)
+ (blue & 0x000000FF));
}
}
mainlayout.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="@+id/mainlayout"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="hello"
/>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="RED"
/>
<SeekBar
android:id="@+id/seekred"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:max="255"
/>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="GREEN"
/>
<SeekBar
android:id="@+id/seekgreen"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:max="255"
/>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="BLUE"
/>
<SeekBar
android:id="@+id/seekblue"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:max="255"
/>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="ALPHA"
/>
<SeekBar
android:id="@+id/seekalpha"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:max="255"
/>
</LinearLayout>
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"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.nowy.MainActivity"
>
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/hello_world" />
<Button
android:id="@+id/buttonOptions"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:text="Opcje" />
</RelativeLayout>
