我正在尝试将对话框中的编辑文本中的值传递给同一活动的文本视图。我正在为对话和活动使用 2 个单独的 xml 文件。
运行我的代码时，出现无法将编辑文本转换为文本视图的错误：请让我知道我做错了什么......
我的代码：
public class Water extends Activity implements OnClickListener{
Button water, date;
private DatePicker date_picker;
static final int DATE_DIALOG_ID = 100;
private static final int DIALOG_TEXT_ENTRY_LOG = 1;
SimpleDateFormat formatter;
String result;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView (R.layout.diary_water);
initialize();
water.setOnClickListener(this);
final Calendar calendar = Calendar.getInstance();
formatter = new SimpleDateFormat("EEE, MMM d, yyyy");
// 3-lettermonth name & 2-char day of month
date.setText(formatter.format(calendar.getTime()));
}
private void initialize() {
// TODO Auto-generated method stub
water = (Button) findViewById(R.id.bGlassOfWater);
date = (Button) findViewById(R.id.bDateWater);
}
@SuppressWarnings("deprecation")
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch(v.getId()){
case R.id.bDateWater:
break;
case R.id.bGlassOfWater:
showDialog (DIALOG_TEXT_ENTRY_LOG);
break;
}
}
@Override
public Dialog onCreateDialog(int id) {
switch (id) {
case DIALOG_TEXT_ENTRY_LOG:
LayoutInflater wat = LayoutInflater.from(this);
final View textEntryViewAcc = wat.inflate(R.layout.glass_of_water, null);
return new AlertDialog.Builder(Water.this)
//.setIconAttribute(android.R.attr.alertDialogIcon)
.setTitle(R.string.Water)
.setView(textEntryViewAcc)
.setPositiveButton(R.string.alert_dialog_save,
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
/* User clicked OK so do some stuff */
LayoutInflater wat = LayoutInflater.from(Water.this);
final EditText glwat= (EditText) ((EditText) dialog).findViewById(R.id.etGlasesOfWater);
result = glwat.getText().toString();
TextView tvwater = (TextView)findViewById(R.id.tvGlassOfWater);
tvwater.setText(result);
}
})
.setNegativeButton(R.string.alert_dialog_cancel,
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int whichButton) {
/* User clicked cancel so do some stuff */
dialog.dismiss();
}
})
.create();
}
return null;
}
}
对话框 XML：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<EditText
android:id="@+id/etGlasesOfWater"
android:layout_width="173dp"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_marginRight="27dp"
android:layout_marginTop="25dp"
android:layout_toLeftOf="@+id/tvGlasses"
android:ems="10"
android:gravity="center_horizontal"
android:scrollHorizontally="true"
android:textAppearance="?android:attr/textAppearanceMedium" >
<requestFocus />
</EditText>
<TextView
android:id="@+id/tvGlasses"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/etGlasesOfWater"
android:layout_alignBottom="@+id/etGlasesOfWater"
android:layout_alignParentRight="true"
android:layout_marginRight="19dp"
android:gravity="left"
android:text="glasses"
android:textAppearance="?android:attr/textAppearanceMedium" />
</RelativeLayout>
主要活动 XML：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="top"
android:background="@drawable/ic_gradient_blue_3"
android:orientation="vertical" >
<TextView
android:id="@+id/tvTrackIt"
android:layout_width="wrap_content"
android:layout_height="40sp"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:background="@drawable/ic_green_diary"
android:gravity="center_vertical|left"
android:paddingLeft="60sp"
android:text="@string/Track"
android:textSize="20sp"
android:textStyle="bold|italic" />
<Button
android:id="@+id/bDateWater"
android:layout_width="150dp"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_below="@+id/tvTrackIt"
android:text="" />
<Button
android:id="@+id/bDone"
android:layout_width="310dp"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:background="@drawable/done_but_gradient"
android:text="Done"
android:textStyle="bold"
android:layout_marginBottom="4dp"/>
<TextView
android:id="@+id/tvGlassOfWater"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/bGlassOfWater"
android:layout_centerHorizontal="true"
android:text=""
android:textStyle="bold"/>
<Button
android:id="@+id/bGlassOfWater"
android:layout_width="230dp"
android:layout_height="130dp"
android:layout_below="@+id/bDateWater"
android:layout_centerHorizontal="true"
android:background="@drawable/ic_water_glass"
android:gravity="top|center_horizontal"
android:text="Amount of Water"
android:textStyle="bold|italic" />
</RelativeLayout>
日志结果：
10-25 16:01:07.648: E/AndroidRuntime(5305): FATAL EXCEPTION: main
10-25 16:01:07.648: E/AndroidRuntime(5305): java.lang.ClassCastException: android.app.AlertDialog cannot be cast to android.widget.EditText
10-25 16:01:07.648: E/AndroidRuntime(5305): at com.margaret.app.easypeasycooking.Water$1.onClick(Water.java:86)
10-25 16:01:07.648: E/AndroidRuntime(5305): at com.android.internal.app.AlertController$ButtonHandler.handleMessage(AlertController.java:166)
10-25 16:01:07.648: E/AndroidRuntime(5305): at android.os.Handler.dispatchMessage(Handler.java:99)
10-25 16:01:07.648: E/AndroidRuntime(5305): at android.os.Looper.loop(Looper.java:137)
10-25 16:01:07.648: E/AndroidRuntime(5305): at android.app.ActivityThread.main(ActivityThread.java:5103)
10-25 16:01:07.648: E/AndroidRuntime(5305): at java.lang.reflect.Method.invokeNative(Native Method)
10-25 16:01:07.648: E/AndroidRuntime(5305): at java.lang.reflect.Method.invoke(Method.java:525)
10-25 16:01:07.648: E/AndroidRuntime(5305): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
10-25 16:01:07.648: E/AndroidRuntime(5305): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
10-25 16:01:07.648: E/AndroidRuntime(5305): at dalvik.system.NativeStart.main(Native Method)