Android开发笔记——对话框和通知

在Android中，提醒用户的方式有三种，分别是Toast，对话框和通知。Toast的方式最为简单，这里就不再介绍了。下面主要介绍一下对话框和通知的方式。

一、对话框

Android中，对话框有5种形式，分别是确定取消对话框、单选对话框、多选对话框、进度对话框以及带有进度条的进度对话框。

1、确定取消对话框

这种对话框，顾名思义，就是含有确定、取消按钮的对话框。

AlertDialog.Builder builder = new Builder(this);
builder.setTitle("确定取消对话框");
builder.setMessage("我是对话框的内容");
builder.setPositiveButton("确定", new OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(getApplicationContext(), "点击确定了", 0).show();
}
});
builder.setNegativeButton("取消", new OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(getApplicationContext(), "点击取消了", 0).show();
}
});
builder.show();

注意，取消按钮点击后，对话框会自动被关闭。

2、单选对话框

AlertDialog.Builder builder = new Builder(this);
builder.setTitle("单选对话框");
final String[] items = {"男","女"};
builder.setSingleChoiceItems(items,0 , new OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(getApplicationContext(), "你的性别是："+items[which], 0).show();
dialog.dismiss();
}
});
builder.show();

3、多选对话框

AlertDialog.Builder builder = new Builder(this);
builder.setTitle("多选对话框");
final String[] items = {"木星","水星","地球","金星","火星"};
final boolean[] result = new boolean[]{true,false,true,false,false};
builder.setMultiChoiceItems(items,result , new OnMultiChoiceClickListener() {
@Override
public void onClick(DialogInterface dialog, int which, boolean isChecked) {
Toast.makeText(getApplicationContext(), items[which]+isChecked, 0).show();
result[which]=isChecked;
}
});
builder.setPositiveButton("提交", new OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
StringBuilder sb = new StringBuilder();
for (int i = 0; i < result.length; i++) {
if(result[i]){
sb.append(items[i]);
}
}
Toast.makeText(getApplicationContext(), sb.toString(), 0).show();
}
});
builder.show();

4、进度对话框

ProgressDialog pd = new ProgressDialog(this);
pd.setTitle("提醒");
pd.setMessage("正在加载数据...请稍等。");
pd.show();

5、带有进度的进度对话框

final ProgressDialog pd = new ProgressDialog(this);
pd.setTitle("进度对话框");
pd.setMessage("下载进度");
pd.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
pd.setMax(100);

pd.show();
new Thread(){
@Override
public void run() {
super.run();
for (int i = 0; i < 100; i++) {
try {
Thread.sleep(40);
pd.setProgress(i);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
pd.dismiss();
}
}.start();

二、通知

NotificationManager nm = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
Notification notification = new Notification(R.drawable.ic_launcher,"新的通知",System.currentTimeMillis());
notification.flags=Notification.FLAG_AUTO_CANCEL;

Intent intent = new Intent();
intent.setAction(Intent.ACTION_CALL);
intent.setData(Uri.parse("tel:110"));

//点击通知栏的通知后，出现的应用
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, 0);
notification.setLatestEventInfo(this, "我是标题", "我是内容", pendingIntent);
nm.notify(0,notification);