我们在开发安卓程序的时候,经常会用到对话框,使得界面的交互能够更加人性化,AlertDialog有别于Toast,AlertDialog显示时间可以随用户操作而定,能够长时间显示在页面布局顶层,而且能够监听用户的下一步操作内容。
我们可以尝试把注册界面搬到Dialog对话框上面,实现的效果是这样的:
一、Java生成组件,嵌入AlertDialog,这里TextView和EditView通过数组去创建。底部是NegativeButton与PositiveButton(AlertDialog自带的两个按钮),点击PositiveButton,触发监听,获取输入的账号和密码数据。
public class MainActivity extends AppCompatActivity {
private Button button;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button = findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
final AlertDialog.Builder alertDialog = new AlertDialog.Builder(MainActivity.this){
@Override
public AlertDialog.Builder setPositiveButton(int textId, DialogInterface.OnClickListener listener) {
return super.setPositiveButton(textId, listener);
}
};
LinearLayout linearLayout = new LinearLayout(MainActivity.this);
final TextView[] textViews = new TextView[2];
final EditText[] editTexts = new EditText[2];
linearLayout.setOrientation(LinearLayout.VERTICAL);
for(int i=0;i<textViews.length;i++){
textViews[i] = new TextView(MainActivity.this);
textViews[i].setTextSize(20);
editTexts[i] = new EditText(MainActivity.this);
if(i==0){
textViews[i].setText("账号");
}else {
textViews[i].setText("密码");
}
linearLayout.addView(textViews[i]);
linearLayout.addView(editTexts[i]);
}
editTexts[1].setInputType(InputType.TYPE_TEXT_VARIATION_PASSWORD);
linearLayout.setPadding(15,15,15,15);
alertDialog.setTitle(">>注册账号");
alertDialog.setView(linearLayout);
alertDialog.setCancelable(false);
alertDialog.setNegativeButton("取消", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
}
});
alertDialog.setPositiveButton("确定", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(MainActivity.this,editTexts[0].getText()+"-"+editTexts[1].getText(),Toast.LENGTH_SHORT).show();
}
});
alertDialog.show();
}
});
}
}
二、使用XML嵌入AlertDialog自定义注册对话框,可以在layout布局下写一个.xml格式的布局文件,然后采用LayoutInflate填充生成View对象,再将View对象通过setView的方法,将界面内容嵌入。注意:在获取Dialog中的内容时,需要使用view.findViewById的形式找到相关的组件,再获取组件的值。
运行效果:
XML布局文件设计:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:padding="20dp">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="45dp">
<TextView
android:id="@+id/textView5"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="bottom|center"
android:textColor="#000"
android:textSize="20sp"
android:text="用户登录界面"/>
</RelativeLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="@+id/label_name"
android:layout_width="60dp"
android:layout_height="40dp"
android:gravity="bottom"
android:textColor="#000"
android:textSize="20sp"
android:text="账号:"/>
<EditText
android:id="@+id/edit_number"
android:layout_toRightOf="@id/label_name"
android:layout_width="200dp"
android:layout_height="wrap_content"
android:inputType="text"
android:maxLines="1"
android:hint="请输入"
/>
</RelativeLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="@+id/label_sex"
android:layout_width="60dp"
android:layout_height="40dp"
android:gravity="bottom"
android:textColor="#000"
android:textSize="20sp"
android:text="密码:"/>
<EditText
android:id="@+id/edit_pwd"
android:layout_toRightOf="@id/label_sex"
android:layout_width="200dp"
android:layout_height="wrap_content"
android:inputType="textPassword"
android:maxLines="1"
android:hint="请输入"
/>
</RelativeLayout>
</LinearLayout>
设置AlertDialog相关代码:
final AlertDialog.Builder alertDialog = new AlertDialog.Builder(DialogActivity.this){
};
LayoutInflater layoutInflater = LayoutInflater.from(DialogActivity.this);
final View view = layoutInflater.inflate(R.layout.layout,null);
alertDialog.setView(view);
alertDialog.setPositiveButton("确定", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
editText_number=view.findViewById(R.id.edit_number);
editText_pwd = view.findViewById(R.id.edit_pwd);
if("zheng".equals(editText_number.getText().toString()) && "12345678".equals(editText_pwd.getText().toString())){
Toast.makeText(DialogActivity.this,"登录成功",Toast.LENGTH_SHORT).show();
}else {
Toast.makeText(DialogActivity.this,"登录失败",Toast.LENGTH_SHORT).show();
}
}
});
alertDialog.setNegativeButton("退出", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
DialogActivity.this.finish();
}
});
alertDialog.show();