我的菜单中有一个项目
case R.id.theme:
ShowRadioDialog();
return true;
使用显示带有3个单选按钮的“警报”对话框的方法。当我单击该项目时，将显示对话框，但是当我在对话框中选择某个项目并点击positiove按钮时，则不会发生任何事情。这是方法：
public void ShowRadioDialog() {
final CharSequence[] items={"Rosso","Verde","Blu"};
AlertDialog.Builder builder=new AlertDialog.Builder(this);
builder.setTitle("Seleziona un colore");
builder.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
@SuppressLint("NewApi")
@Override
public void onClick(DialogInterface dialog, int which) {
if (wich== 1) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
getWindow().addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
getWindow().setStatusBarColor(MainActivity.this.getResources().getColor(R.color.red));
toolbar.setBackgroundColor(MainActivity.this.getResources().getColor(R.color.red));
Toast.makeText(MainActivity.this, "Rosso OK", Toast.LENGTH_SHORT).show();
Log.i("Colors", "Rosso Ok");
}
} else if (wich ==2) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
getWindow().addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
getWindow().setStatusBarColor(MainActivity.this.getResources().getColor(R.color.green_welcome));
}
} else if (wich == 3){
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
getWindow().addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
getWindow().setStatusBarColor(MainActivity.this.getResources().getColor(R.color.primary_dark_blue));
}
}
}
});
builder.setSingleChoiceItems(items,-1, new DialogInterface.OnClickListener() {
@SuppressLint("NewApi")
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
if ("Rosso".equals(items[which])) {
which = 1;
} else if ("Verde".equals(items[which])) {
which = 2;
} else if ("Blu".equals(items[which])) {
which = 3;
}
}
});
builder.show();
}
我不确定这是正确的方法。但是，不会出现任何一个（在logcat中登录，在应用程序中为Toast）。似乎肯定按钮不接受选择。有什么问题吗？
在顶层定义一个变量，并使用该变量访问所选项目。
int index = -1;
public void ShowRadioDialog() {
final CharSequence[] items={"Rosso","Verde","Blu"};
AlertDialog.Builder builder=new AlertDialog.Builder(this);
builder.setTitle("Seleziona un colore");
builder.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
@SuppressLint("NewApi")
@Override
public void onClick(DialogInterface dialog, int which) {
if (index == 1) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
getWindow().addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
getWindow().setStatusBarColor(MainActivity.this.getResources().getColor(R.color.red));
toolbar.setBackgroundColor(MainActivity.this.getResources().getColor(R.color.red));
Toast.makeText(MainActivity.this, "Rosso OK", Toast.LENGTH_SHORT).show();
Log.i("Colors", "Rosso Ok");
}
} else if (index ==2) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
getWindow().addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
getWindow().setStatusBarColor(MainActivity.this.getResources().getColor(R.color.green_welcome));
}
} else if (index == 3){
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
getWindow().addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
getWindow().setStatusBarColor(MainActivity.this.getResources().getColor(R.color.primary_dark_blue));
}
}
}
});
builder.setSingleChoiceItems(items,-1, new DialogInterface.OnClickListener() {
@SuppressLint("NewApi")
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
if ("Rosso".equals(items[which])) {
index = 1;
} else if ("Verde".equals(items[which])) {
index = 2;
} else if ("Blu".equals(items[which])) {
index = 3;
}
}
});
builder.show();
}
如果要index在单击“确定”按钮时保存“共享首选项”中的值，请执行以下操作
存储在SharedPreferences中
SharedPreferences preferences = getSharedPreferences("myPref", getApplicationContext().MODE_PRIVATE);
Editor editor = preferences.edit();
editor.putInt("choice", index);
editor.commit();
需要时从SharedPreferences中获取
SharedPreferences preferences = getSharedPreferences("myPref", getApplicationContext().MODE_PRIVATE);
int index = preferences.getInt("choice",-1);
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我来说两句