Android中对话框的展示，对人机交互有着重要的意义，常见的对话框包括：
警告对话框
进度对话框
日期选择对话框
时间选择对话框
普通列表对话框
单选列表对话框
多选列表对话框
带图标的列表对话框
对于特殊的对话框形式还可以自定义对话框
下面对这些对话框的使用进行说明：
1.警告对话框
private void showAlertDialog() {
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("提示");
builder.setIcon(R.mipmap.ic_launcher);
builder.setMessage("您有一笔2千万的汇款在处理，请问是您亲自操作的吗？");
builder.setPositiveButton(R.string.confirm, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
Log.d(TAG, "onClick: " + i);
toast(R.string.confirm);
}
});
builder.setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
dialogInterface.dismiss();
toast(R.string.cancel);
}
});
builder.setNeutralButton(R.string.exit, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
Log.d(TAG, "onClick: " + i);
toast(R.string.exit);
}
});
AlertDialog dialog = builder.create();
dialog.show();
}2.进度对话框
private void showPgsDialog() {
final ProgressDialog dialog = new ProgressDialog(this);
dialog.setTitle("下载提示");
dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
dialog.setMax(100);
dialog.setButton(DialogInterface.BUTTON_POSITIVE, getString(R.string.background), new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
}
});
dialog.onStart();
new Thread(new Runnable() {
@Override
public void run() {
int i = 10;
while (i <= 100) {
try {
Thread.sleep(100);
dialog.incrementProgressBy(1);
i++;
} catch (InterruptedException e) {
e.printStackTrace();
}
}
dialog.dismiss();
}
}).start();
dialog.show();
}3.日期选择对话框
private void showDatePickerDialog() {
Calendar calendar = Calendar.getInstance();
int year = calendar.get(Calendar.YEAR);
int month = calendar.get(Calendar.MONTH);
int day = calendar.get(Calendar.DAY_OF_MONTH);
DatePickerDialog dialog = new MyDatePickerDialog(this, new DatePickerDialog.OnDateSetListener() {
@Override
public void onDateSet(DatePicker datePicker, int year, int monthOfYear, int dayOfMonth) {
Log.d(TAG, "onDateSet: " + year + "." + (monthOfYear + 1) + "." + dayOfMonth);
String date = String.format(Locale.CHINESE, "%04d.%02d.%02d", year, monthOfYear + 1, dayOfMonth);
btDate.setText(date);
}
}, year, month, day);
dialog.show();
}在构造DatePickerDialog的时候需要传入初始化的year,month,day，monthOfYear是从0开始的，所以得到的月份要记得加1。
4.时间选择对话框
private void showTimePickerDialog() {
Calendar calendar = Calendar.getInstance();
int hour = calendar.get(Calendar.HOUR_OF_DAY);
int minute = calendar.get(Calendar.MINUTE);
TimePickerDialog dialog = new MyTimePickerDialog(this, new TimePickerDialog.OnTimeSetListener() {
@Override
public void onTimeSet(TimePicker timePicker, int hourOfDay, int minute) {
Log.d(TAG, "onTimeSet: " + hourOfDay + ":" + minute);
String time = String.format(Locale.CHINESE, "%02d:%02d", hourOfDay, minute);
btTime.setText(time);
}
}, hour, minute, true);
dialog.show();
}在构造TimePickerDialog时要传入初始化的hour和minute，第五个参数是布尔型变量，是否是24小时制，传入true设置24小时制，反之亦然。
注意： 在使用DatePickerDialog和TimePickerDialog时，要解决兼容性的问题，在回调onDateSet时，4.3系统后会回调两次，而4.3以下的则回调一次，这样很影响业务逻辑，要解决这个问题，需要重写DatePickerDialog的onStop方法，将super.onStop()方法去掉即可。详细可参考http://blog.csdn.net/wxuande/article/details/44002791
public class MyDatePickerDialog extends DatePickerDialog {
public MyDatePickerDialog(Context context, OnDateSetListener listener, int year, int month, int dayOfMonth) {
super(context, listener, year, month, dayOfMonth);
}
public MyDatePickerDialog(Context context, int themeResId, OnDateSetListener listener, int year, int monthOfYear, int dayOfMonth) {
super(context, themeResId, listener, year, monthOfYear, dayOfMonth);
}
//解决兼容性问题，即onDateSet方法回调两次的bug
@Override
protected void onStop() {
}
}5.普通列表对话框
//核心方法
builder.setItems(arrayColor, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
Log.d(TAG, "onClick: " + arrayColor[i]);
toast("你选择的是：" + arrayColor[i]);
}
});6.单选列表对话框
//核心方法
builder.setSingleChoiceItems(arrayGender, -1, new DialogInterface.OnClickListener() {
@Override
public void onClick(final DialogInterface dialogInterface, int i) {
Log.d(TAG, "onClick: " + arrayGender[i]);
toast("你选择的是：" + arrayGender[i]);
}
});setSingleChoiceItems的第二个参数是item的index，-1表示不预先选择，0表示选择第一项，以此类推。
7.多选列表对话框
//核心方法
final boolean[] pos = new boolean[arrayFruits.length];
builder.setMultiChoiceItems(arrayFruits, null, new DialogInterface.OnMultiChoiceClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i, boolean b) {
pos[i] = b;
}
});
builder.setPositiveButton(R.string.confirm, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int which) {
StringBuilder sb = new StringBuilder();
for (int i = 0, length = pos.length; i < length; i++) {
if (pos[i]) {
sb.append(arrayFruits[i]);
sb.append("、");
}
}
Log.d(TAG, "onClick: " + sb.deleteCharAt(sb.length() - 1).toString());
toast("你选择的是：" + sb.deleteCharAt(sb.length() - 1).toString());
}
});setMultiChoiceItems的第二个参数表示的是被选中的item，null表示不设默认值。
8.带图标的列表对话框
//核心方法
builder.setAdapter(new ListItemAdapter(), new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
toast("你选择的是：" + arrayColor[which]);
}
});private class ListItemAdapter extends BaseAdapter {
int[] imgIds = {R.mipmap.ic_launcher, R.mipmap.ic_launcher, R.mipmap.ic_launcher};
@Override
public int getCount() {
return imgIds.length;
}
@Override
public Integer getItem(int position) {
return imgIds[position];
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
TextView textView = new TextView(MainActivity.this);
textView.setText(getResources().getStringArray(R.array.colors)[position]);
textView.setTextSize(24);
AbsListView.LayoutParams layoutParams = new AbsListView.LayoutParams(
AbsListView.LayoutParams.MATCH_PARENT, AbsListView.LayoutParams.WRAP_CONTENT
);
textView.setGravity(Gravity.CENTER_VERTICAL);
textView.setLayoutParams(layoutParams);
textView.setCompoundDrawablesWithIntrinsicBounds(getItem(position), 0, 0, 0);
textView.setPadding(40, 0, 40, 0);
textView.setCompoundDrawablePadding(8);
return textView;
}
}9.自定义对话框
//核心方法
final View root = LayoutInflater.from(this).inflate(R.layout.dialog_login, null);
builder.setView(root);
builder.setPositiveButton(R.string.confirm, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
String name = ((EditText) root.findViewById(R.id.et_name)).getText().toString();
String pwd = ((EditText) root.findViewById(R.id.et_pwd)).getText().toString();
if (TextUtils.isEmpty(name)) {
toast("账号不能为空");
return;
}
if (TextUtils.isEmpty(pwd)) {
toast("密码不能为空");
return;
}
toast("账号：" + name + ", 密码：" + pwd);
}
});这里是创建一个布局文件，当然也可以直接定义控件，但是要注意布局的美观就可以了。
