我可以通過編程方式更改android對話框主題背景顏色嗎？

Question

我用對話的主題，以顯示我的活動

<activity 
    android:name=".MyDialog" 
    android:theme="@android:style/Theme.Holo.Light.Dialog.NoActionBar" > 
</activity> 

本次活動搜索條。

alphaSeek=(SeekBar)findViewById(R.id.seekbar_alpha); 
alphaSeek.setOnSeekBarChangeListener(this); 

@Override 
public void onProgressChanged(SeekBar seekBar, int progress, 
           boolean fromUser) { 
    ???=progress; 
} 

我可以使用seekbar值來改變對話框背景的顏色嗎？

---

更新：

基於第一個答案，我重寫程序，註釋行是以前版本的我試過了。但新版本與前一版本效果完全相同，它只改變對話框中的顏色，而不改變對話框的背景。

int alpha=0; 
int red=0; 
int green=0; 
int blue=0; 
SeekBar alphaSeek; 

LinearLayout myActivityLayout; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.mydialog); 

    myActivityLayout = (LinearLayout) findViewById(R.id.MyActivityLayout); 

    alphaSeek=(SeekBar)findViewById(R.id.seekbar); 
    alphaSeek.setOnSeekBarChangeListener(this); 

} 

@Override 
public void onProgressChanged(SeekBar seekBar, int progress, 
           boolean fromUser) { 

    String hex = String.format("%02x%02x%02x%02x", alpha, red, green, blue); 
    int color=(int)Long.parseLong(hex,16); 
    //ColorDrawable cd=new ColorDrawable(color); 
    //getWindow().setBackgroundDrawable(cd); 

    myActivityLayout.setBackgroundColor(color); 
} 

版式XML

<LinearLayout 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:orientation="vertical" 
    android:id="@+id/MyActivityLayout" 
    tools:context="com.MyDialog"> 

    <SeekBar 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:max="255" 
     android:id="@+id/seekbar" 
     android:layout_gravity="center_horizontal" /> 

</LinearLayout> 

的AndroidManifest.xml

<activity 
    android:name=".MyDialog" 
    android:theme="@android:style/Theme.Holo.Light.Dialog.NoActionBar" > 
</activity> 

Answer 1

當SeekBarChange，所述onProgressChanged()OnSeekBarChangeListener的將被調用，並且在屏幕上（LinearLayout）的背景將根據被更新（SeekBar.getProgress()）。

你可以像下面這樣：

package com.exercise.seekcolor; 

import android.app.Activity; 
import android.os.Bundle; 
import android.widget.LinearLayout; 
import android.widget.SeekBar; 

public class SeekColorActivity extends Activity { 

private int seekR, seekG, seekB; 
SeekBar redSeekBar, greenSeekBar, blueSeekBar; 
LinearLayout mScreen; 

/** Called when the activity is first created. */ 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 

    mScreen = (LinearLayout) findViewById(R.id.myScreen); 
    redSeekBar = (SeekBar) findViewById(R.id.mySeekingBar_R); 
    greenSeekBar = (SeekBar) findViewById(R.id.mySeekingBar_G); 
    blueSeekBar = (SeekBar) findViewById(R.id.mySeekingBar_B); 
    updateBackground(); 

    redSeekBar.setOnSeekBarChangeListener(seekBarChangeListener); 
    greenSeekBar.setOnSeekBarChangeListener(seekBarChangeListener); 
    blueSeekBar.setOnSeekBarChangeListener(seekBarChangeListener); 

} 

private SeekBar.OnSeekBarChangeListener seekBarChangeListener 
= new SeekBar.OnSeekBarChangeListener() 
{ 

@Override 
public void onProgressChanged(SeekBar seekBar, int progress, 
    boolean fromUser) { 
// TODO Auto-generated method stub 
updateBackground(); 
} 
@Override 
public void onStartTrackingTouch(SeekBar seekBar) { 
// TODO Auto-generated method stub 
} 

@Override 
public void onStopTrackingTouch(SeekBar seekBar) { 
// TODO Auto-generated method stub 
} 
}; 

private void updateBackground() 
{ 
seekR = redSeekBar.getProgress(); 
seekG = greenSeekBar.getProgress(); 
seekB = blueSeekBar.getProgress(); 
mScreen.setBackgroundColor(
    0xff000000 
    + seekR * 0x10000 
    + seekG * 0x100 
    + seekB 
); 
} 
} 

參考：change-background-color-by-seekbar。