我們在開發安卓程序的時候,經常會用到對話框,使得界面的交互能夠更加人性化,AlertDialog有別於Toast,AlertDialog顯示時間可以隨用戶操作而定,能夠長時間顯示在頁面佈局頂層,而且能夠監聽用戶的下一步操作內容。
我們可以嘗試把註冊界面搬到Dialog對話框上面,實現的效果是這樣的:
一、Java生成組件,嵌入AlertDialog,這裏TextView和EditView通過數組去創建。底部是NegativeButton與PositiveButton(AlertDialog自帶的兩個按鈕),點擊PositiveButton,觸發監聽,獲取輸入的賬號和密碼數據。
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("賬號");
}else {
textViews[i].setText("密碼");
}
linearLayout.addView(textViews[i]);
linearLayout.addView(editTexts[i]);
}
editTexts[1].setInputType(InputType.TYPE_TEXT_VARIATION_PASSWORD);
linearLayout.setPadding(15,15,15,15);
alertDialog.setTitle(">>註冊賬號");
alertDialog.setView(linearLayout);
alertDialog.setCancelable(false);
alertDialog.setNegativeButton("取消", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
}
});
alertDialog.setPositiveButton("確定", 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自定義註冊對話框,可以在layout佈局下寫一個.xml格式的佈局文件,然後採用LayoutInflate填充生成View對象,再將View對象通過setView的方法,將界面內容嵌入。注意:在獲取Dialog中的內容時,需要使用view.findViewById的形式找到相關的組件,再獲取組件的值。
運行效果:
XML佈局文件設計:
<?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="用戶登錄界面"/>
</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="賬號:"/>
<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="請輸入"
/>
</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="密碼:"/>
<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="請輸入"
/>
</RelativeLayout>
</LinearLayout>
設置AlertDialog相關代碼:
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("確定", 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,"登錄成功",Toast.LENGTH_SHORT).show();
}else {
Toast.makeText(DialogActivity.this,"登錄失敗",Toast.LENGTH_SHORT).show();
}
}
});
alertDialog.setNegativeButton("退出", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
DialogActivity.this.finish();
}
});
alertDialog.show();