我的Android进阶之旅------>Android中Dialog系统样式讲解

      今天在维护公司的一个APP的时候,有如下场景。

弹出一个AlertDialog的时候，在系统语言是中文的时候，如下所示：

弹出一个AlertDialog的时候，在系统语言是English的时候，如下所示：

 

可以发现在系统语言为英语的时候，对话框中的白色文字已经完全看不清楚，对话框的背景颜色也变成了白色。因此需要修改对话框的主题。

 

修改之前代码如下：

AlertDialog commedialog = new AlertDialog.Builder(

 WalkieTalkieActivity.this)

 .setTitle(title)

 .setView(vi_nolong)

 .setPositiveButton(

 WalkieTalkieActivity.this.getResources().getString(R.string.ok),

 new DialogInterface.OnClickListener() {

 public void onClick(DialogInterface dialog, int arg1) {

 int j = mSelectedGroupNum + 1;

 int power_last = mIntercomSharePrefs.getInt("CurrentPower_"+j,0);

 Log.i("wxj", "btn_power CurrentPower_"+j+" :" + power_last);

 if (power_last == 1) {

 mEditor.putInt("CurrentPower_"+j,0).commit();

 mIntercom.setPowerLevel(0);

 btn_power.setBackgroundResource(R.drawable.power_high);

 } else if (power_last == 0) {

 mEditor.putInt("CurrentPower_"+j,1).commit();

 mIntercom.setPowerLevel(1);

 btn_power.setBackgroundResource(R.drawable.power_low);

 dialog.dismiss();

 ((ViewGroup) vi_nolong.getParent()).removeView(vi_nolong); 

 .setNegativeButton(

 WalkieTalkieActivity.this.getResources().getString(R.string.cancel),

 new DialogInterface.OnClickListener() {

 public void onClick(DialogInterface dialog,

 int whichButton) {

 dialog.dismiss();

 ((ViewGroup) vi_nolong.getParent()).removeView(vi_nolong); 

 }).create();

 commedialog.setCanceledOnTouchOutside(false);

 commedialog.show();

 

可以发现，new AlertDialog.Builder的时候没有指定主题，

AlertDialog commedialog = new AlertDialog.Builder(WalkieTalkieActivity.this)

我们可以在new AlertDialog.Builder的时候指定一个主题，如下所示：

 

AlertDialog commedialog = new AlertDialog.Builder(

 WalkieTalkieActivity.this,AlertDialog.THEME_HOLO_DARK)

 

完整代码如下：

AlertDialog commedialog = new AlertDialog.Builder(

 WalkieTalkieActivity.this,AlertDialog.THEME_HOLO_DARK)

 .setTitle(title)

 .setView(vi_nolong)

 .setPositiveButton(

 WalkieTalkieActivity.this.getResources().getString(R.string.ok),

 new DialogInterface.OnClickListener() {

 public void onClick(DialogInterface dialog, int arg1) {

 int j = mSelectedGroupNum + 1;

 int power_last = mIntercomSharePrefs.getInt("CurrentPower_"+j,0);

 Log.i("wxj", "btn_power CurrentPower_"+j+" :" + power_last);

 if (power_last == 1) {

 mEditor.putInt("CurrentPower_"+j,0).commit();

 mIntercom.setPowerLevel(0);

 btn_power.setBackgroundResource(R.drawable.power_high);

 } else if (power_last == 0) {

 mEditor.putInt("CurrentPower_"+j,1).commit();

 mIntercom.setPowerLevel(1);

 btn_power.setBackgroundResource(R.drawable.power_low);

 dialog.dismiss();

 ((ViewGroup) vi_nolong.getParent()).removeView(vi_nolong); 

 .setNegativeButton(

 WalkieTalkieActivity.this.getResources().getString(R.string.cancel),

 new DialogInterface.OnClickListener() {

 public void onClick(DialogInterface dialog,

 int whichButton) {

 dialog.dismiss();

 ((ViewGroup) vi_nolong.getParent()).removeView(vi_nolong); 

 }).create();

 commedialog.setCanceledOnTouchOutside(false);

 commedialog.show();

 

这样的话就指定了一个黑色背景的主题，这样在系统语言为英语的时候，背景也是黑色的，如下所示：

在系统语言为中文的时候，背景也是黑色的，如下所示：

 

====================================================================================================================================

下面从源码角度来看看到底是怎么回事，查看AlertDialog.Build代码如下：

 /**

 * Constructor using a context for this builder and the {@link AlertDialog} it creates.

 public Builder(Context context) {

 this(context, resolveDialogTheme(context, 0));

 * Constructor using a context and theme for this builder and

 * the {@link AlertDialog} it creates. The actual theme

 * that an AlertDialog uses is a private implementation, however you can

 * here supply either the name of an attribute in the theme from which

 * to get the dialogs style (such as {@link android.R.attr#alertDialogTheme}

 * or one of the constants

 * {@link AlertDialog#THEME_TRADITIONAL AlertDialog.THEME_TRADITIONAL},

 * {@link AlertDialog#THEME_HOLO_DARK AlertDialog.THEME_HOLO_DARK}, or

 * {@link AlertDialog#THEME_HOLO_LIGHT AlertDialog.THEME_HOLO_LIGHT}.

 public Builder(Context context, int theme) {

 P = new AlertController.AlertParams(new ContextThemeWrapper(

 context, resolveDialogTheme(context, theme)));

 mTheme = theme;

 }

resolveDialogTheme(Context context, int resid) 代码如下：

 

 static int resolveDialogTheme(Context context, int resid) {

 if (resid == THEME_TRADITIONAL) {

 return com.android.internal.R.style.Theme_Dialog_Alert;

 } else if (resid == THEME_HOLO_DARK) {

 return com.android.internal.R.style.Theme_Holo_Dialog_Alert;

 } else if (resid == THEME_HOLO_LIGHT) {

 return com.android.internal.R.style.Theme_Holo_Light_Dialog_Alert;

 } else if (resid == THEME_DEVICE_DEFAULT_DARK) {

 return com.android.internal.R.style.Theme_DeviceDefault_Dialog_Alert;

 } else if (resid == THEME_DEVICE_DEFAULT_LIGHT) {

 return com.android.internal.R.style.Theme_DeviceDefault_Light_Dialog_Alert;

 } else if (resid = 0x01000000) { // start of real resource IDs.

 return resid;

 } else {

 TypedValue outValue = new TypedValue();

 context.getTheme().resolveAttribute(com.android.internal.R.attr.alertDialogTheme,

 outValue, true);

 return outValue.resourceId;

 }

几个主题的值为：

 /**

 * Special theme constant for {@link #AlertDialog(Context, int)}: use

 * the traditional (pre-Holo) alert dialog theme.

 public static final int THEME_TRADITIONAL = 1;

 * Special theme constant for {@link #AlertDialog(Context, int)}: use

 * the holographic alert theme with a dark background.

 public static final int THEME_HOLO_DARK = 2;

 * Special theme constant for {@link #AlertDialog(Context, int)}: use

 * the holographic alert theme with a light background.

 public static final int THEME_HOLO_LIGHT = 3;

 * Special theme constant for {@link #AlertDialog(Context, int)}: use

 * the devices default alert theme with a dark background.

 public static final int THEME_DEVICE_DEFAULT_DARK = 4;

 * Special theme constant for {@link #AlertDialog(Context, int)}: use

 * the devices default alert theme with a dark background.

 public static final int THEME_DEVICE_DEFAULT_LIGHT = 5;

由此可见，当我们不指定主题的时候，

AlertDialog commedialog = new AlertDialog.Builder(WalkieTalkieActivity.this) 

系统给我们的主题是：

 TypedValue outValue = new TypedValue();

 context.getTheme().resolveAttribute(com.android.internal.R.attr.alertDialogTheme,

 outValue, true);

 return outValue.resourceId;

 

====================================================================================================================================

下面分别来测试一下这几个主题

主题为：AlertDialog.THEME_HOLO_LIGHT

AlertDialog commedialog = new AlertDialog.Builder(

 WalkieTalkieActivity.this,AlertDialog.THEME_HOLO_LIGHT)

 

主题为：AlertDialog.THEME_TRADITIONAL

AlertDialog commedialog = new AlertDialog.Builder(

 WalkieTalkieActivity.this,AlertDialog.THEME_TRADITIONAL)

 

主题为：AlertDialog.THEME_DEVICE_DEFAULT_DARK

AlertDialog commedialog = new AlertDialog.Builder(

 WalkieTalkieActivity.this,AlertDialog.THEME_DEVICE_DEFAULT_DARK)

 

主题为：AlertDialog.THEME_DEVICE_DEFAULT_LIGHT

AlertDialog commedialog = new AlertDialog.Builder(

 WalkieTalkieActivity.this,AlertDialog.THEME_DEVICE_DEFAULT_LIGHT)

 

====================================================================================

  作者：欧阳鹏  欢迎转载，与人分享是进步的源泉！

  转载请保留原文地址：http://blog.csdn.net/ouyang_peng

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