Question

I am looking for widget Switch. Not switch statement or switch activity etc.

There was very rare tutorial on web.

My problem is graphical layout in xml cannot see the switch.

my xml

<RelativeLayout
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_margin="10dp" >

    <TextView
        android:id="@+id/text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="推送通知"
        android:textColor="#ffffff"
        android:textSize="20dp" />

    <TextView
        android:id="@+id/status"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/text"
        android:layout_marginTop="5dp"
        android:textColor="#ffffff"
        android:textSize="15dp" />

    <Switch
        android:id="@+id/switch"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:textOff="关"
        android:textOn="开" />
</RelativeLayout>

The error occurs at the there.

Error

Missing styles. Is the correct theme chosen for this layout?
Use the Theme combo box above the layout to choose a different layout, or fix the theme style references.

NOTE: This project contains resource errors, so aapt did not succeed, which can cause rendering failures. Fix resource problems first.

Failed to find style 'switchStyle' in current theme
java.lang.NullPointerException
Exception details are logged in Window > Show View > Error Log

I got no idea how to do it?

Answer 1

Your AndroidManifest.xml should have

 <uses-sdk
    android:minSdkVersion="14"
    android:targetSdkVersion="16" />

Because Switch widget supports 14 and above API level only..

A simple example for you..

main.xml
<GridLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

            <Switch
                android:id="@+id/bluetooth"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginBottom="32dip"
                android:text="Bluetooth"
                />

</GridLayout>

ur .java



package time.pass;

import android.os.Bundle;
import android.app.Activity;
import android.widget.CompoundButton;
import android.widget.Switch;
import android.widget.Toast;

public class TimePass extends Activity implements CompoundButton.OnCheckedChangeListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_time_pass );

    Switch s = (Switch) findViewById(R.id.bluetooth);
    if (s != null) {
        s.setOnCheckedChangeListener(this);
    }
}


@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
   Toast.makeText(this, "Bluetooth is " + (isChecked ? "on" : "off"),
           Toast.LENGTH_SHORT).show();
}
}