Wie kann ich die Zeitauswahl mit der richtigen App und mit angemessenem Stil hinzufügen?

Question

ich weiß möchten, wo das Problem ist, weil ich diesen Fehler aller Zeiten erhalten:

Fehlende Stile. Ist das richtige Thema für dieses Layout ausgewählt? Verwenden Sie das Kombinationsfeld "Design" über dem Layout, um ein anderes Layout auszuwählen, oder korrigieren Sie die Designstilreferenzen.

Konnte die Themenressource nicht finden? Attr/colorAccent für das aktuelle Thema Konnte "? Attr/colorAccent" im aktuellen Thema nicht finden.

Main_activity:

package dz.timepicker; 
import java.util.Calendar; 

import android.app.Activity; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.TextView; 
import android.widget.TimePicker; 

public class MainActivity extends Activity { 
    private TimePicker timePicker1; 
    private TextView time; 
    private Calendar calendar; 
    private String format = ""; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 

     timePicker1 = (TimePicker) findViewById(R.id.timePicker1); 
     time = (TextView) findViewById(R.id.tv1); 
     calendar = Calendar.getInstance(); 

     int hour = calendar.get(Calendar.HOUR_OF_DAY); 
     int min = calendar.get(Calendar.MINUTE); 
     showTime(hour, min); 
    } 

    public void setTime(View view) { 
     int hour = timePicker1.getCurrentHour(); 
     int min = timePicker1.getCurrentMinute(); 
     showTime(hour, min); 
    } 

    public void showTime(int hour, int min) { 
     if (hour == 0) { 
     hour += 12; 
     format = "AM"; 
     } 
     else if (hour == 12) { 
     format = "PM"; 
     } else if (hour > 12) { 
     hour -= 12; 
     format = "PM"; 
     } else { 
     format = "AM"; 
     } 
     time.setText(new StringBuilder().append(hour).append(" : ").append(min) 
     .append(" ").append(format)); 
    } 


} 

main_activity.xml:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:tools="http://schemas.android.com/tools" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
tools:context=".MainActivity" > 

<TextView 
    android:id="@+id/textView2" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_alignParentTop="true" 
    android:layout_centerHorizontal="true" 
    android:text="@string/time_pick" 
    android:textAppearance="?android:attr/textAppearanceMedium" /> 

<Button 
    android:id="@+id/set_button" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_alignParentBottom="true" 
    android:layout_centerHorizontal="true" 
    android:layout_marginBottom="180dp" 
    android:onClick="setTime" 
    android:text="@string/time_save" /> 

<TimePicker 
    android:id="@+id/timePicker1" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_above="@+id/set_button" 
    android:layout_centerHorizontal="true" 
    android:layout_marginBottom="24dp" /> 

<TextView 
    android:id="@+id/textView3" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_alignStart="@+id/timePicker1" 
    android:layout_alignTop="@+id/set_button" 
    android:layout_marginTop="67dp" 
    android:text="@string/time_current" 
    android:textAppearance="?android:attr/textAppearanceMedium" /> 

<TextView 
    android:id="@+id/tv1" 
    android:labelFor="@+id/textView1" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_below="@+id/textView3" 
    android:layout_centerHorizontal="true" 
    android:layout_marginTop="50dp" 
    android:text="@string/time_selected" 
    android:textAppearance="?android:attr/textAppearanceMedium" /> 

String.xml:

<?xml version="1.0" encoding="utf-8"?> 
<resources> 
<string name="app_name">TimePicker</string> 
    <string name="action_settings">Settings</string> 
    <string name="time_picker_example">Time Picker Example</string> 
    <string name="time_pick">Pick the time and press save button</string> 
    <string name="time_save">Save</string> 
    <string name="time_selected"></string> 
    <string name="time_current">The Time is:</string> 
</resources> 

Style.xm l:

<resources> 

    <!-- 
     Base application theme, dependent on API level. This theme is replaced 
     by AppBaseTheme from res/values-vXX/styles.xml on newer devices. 

    --> 
    <style name="AppBaseTheme" parent="android:Theme.Light"> 
     <!-- 
      Theme customizations available in newer API levels can go in 
      res/values-vXX/styles.xml, while customizations related to 
      backward-compatibility can go here. 
     --> 
    </style> 

    <!-- Application theme. --> 
    <style name="AppTheme" parent="AppBaseTheme"> 
     <!-- All customizations that are NOT specific to a particular API-level can go here. --> 
    </style> 

</resources> 

AndroidManifest:

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
    package="dz.timepicker" 
    android:versionCode="1" 
    android:versionName="1.0" > 

    <uses-sdk 
     android:minSdkVersion="23" 
     android:targetSdkVersion="23" /> 

    <application 
     android:allowBackup="true" 
     android:icon="@drawable/ic_launcher" 
     android:label="@string/app_name" 
     android:theme="@style/AppTheme" > 
     <activity 
      android:name=".MainActivity" 
      android:label="@string/app_name" > 
      <intent-filter> 
       <action android:name="android.intent.action.MAIN" /> 

       <category android:name="android.intent.category.LAUNCHER" /> 
      </intent-filter> 
     </activity> 
    </application> 

</manifest> 

Answer 1

Nun, android:Theme.Light ist das Thema.

?attr/colorAccent ist ein Attribut.

Und Ihr Fehler besagt, dass Thema dieses Attribut nicht enthält.

Sie können es gerne zu Ihrer AppBaseTheme hinzufügen. Fühlen Sie sich frei, eine beliebige Farbe zu verwenden