java - 如何在android中使用带有 'onCheckedChanged'方法的switch语句？

Question

多年来我一直在努力让它工作，我想要它，这样我就可以将两个 checkedChanged 放在一个 OnCheckedChanged 方法中。到目前为止，我所拥有的不起作用，但正如我之前只有一种情况那样，没有 switch 语句起作用。请您看看我的代码，看看我如何修复它才能使其正常工作？

代码如下:

public class MainActivity extends Activity implements OnClickListener, OnCheckedChangeListener {

    Button sensorButton;
    Button newScreen;
    Switch vibrateToggle;
    Switch lightsToggle;
    NotificationManager nm1;
    NotificationManager nm2;
    static final int uniqueID1 = 12345;
    static final int uniqueID2 = 54321;
    OnCheckedChangeListener vibrateListener;
    OnCheckedChangeListener lightsListener;

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

        sensorButton = (Button)this.findViewById(R.id.sensorButton);
        sensorButton.setOnClickListener(this);

        newScreen = (Button)this.findViewById(R.id.newScreen);
        newScreen.setOnClickListener(this);

        nm1 = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
        nm1.cancel(uniqueID1);

        nm2 = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
        nm2.cancel(uniqueID2); 

        vibrateToggle = (Switch)this.findViewById(R.id.switch1);
        vibrateToggle.setOnCheckedChangeListener(vibrateListener);

        lightsToggle = (Switch)this.findViewById(R.id.lightSwitch);
        lightsToggle.setOnCheckedChangeListener(lightsListener);    
    }


    @Override
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        // TODO Auto-generated method stub
        switch(buttonView.getId()){

        case R.id.switch1:
            Toast.makeText(this, "Vibrate Notification is " + (isChecked ? "ON" : "OFF"),
                Toast.LENGTH_SHORT).show();
                if (isChecked) {
                    // The toggle is enabled
                    Intent vibrateIntent = new Intent(this, MainActivity.class);
                    PendingIntent vibratePi = PendingIntent.getActivity(this, 0, vibrateIntent, 0);
                    NotificationCompat.Builder vibrateN = new NotificationCompat.Builder(this);
                    vibrateN.setContentIntent(vibratePi);
                    vibrateN.setDefaults(Notification.DEFAULT_VIBRATE);
                    Notification vn = vibrateN.build();
                    nm2.notify(uniqueID2, vn);
                } else {
                    // The toggle is disabled
                }

        case R.id.lightSwitch:
            Toast.makeText(this, "Lights Notification is " + (isChecked ? "ON" : "OFF"),
                    Toast.LENGTH_SHORT).show();
                    if (isChecked) {
                        // The toggle is enabled
                        Intent lightsIntent = new Intent(this, MainActivity.class);
                        PendingIntent lightsPi = PendingIntent.getActivity(this, 0, lightsIntent, 0);
                        NotificationCompat.Builder lightsN = new NotificationCompat.Builder(this);
                        lightsN.setContentIntent(lightsPi);
                        lightsN.setDefaults(Notification.DEFAULT_LIGHTS);
                        Notification ln = lightsN.build();
                        nm2.notify(uniqueID2, ln);
                    } else {
                        // The toggle is disabled
                    }

             break;
        }
    }

这是我得到的 logcat:

03-14 16:46:21.139: D/dalvikvm(532): Not late-enabling CheckJNI (already on)
03-14 16:46:22.218: I/dalvikvm(532): threadid=3: reacting to signal 3
03-14 16:46:22.338: I/dalvikvm(532): Wrote stack traces to '/data/anr/traces.txt'
03-14 16:46:22.728: I/dalvikvm(532): threadid=3: reacting to signal 3
03-14 16:46:22.739: I/dalvikvm(532): Wrote stack traces to '/data/anr/traces.txt'
03-14 16:46:23.238: I/dalvikvm(532): threadid=3: reacting to signal 3
03-14 16:46:23.278: I/dalvikvm(532): Wrote stack traces to '/data/anr/traces.txt'
03-14 16:46:23.509: D/gralloc_goldfish(532): Emulator without GPU emulation detected.
03-14 16:46:25.258: D/AndroidRuntime(532): Shutting down VM
03-14 16:46:25.258: W/dalvikvm(532): threadid=1: thread exiting with uncaught exception (group=0x409c01f8)
03-14 16:46:25.288: E/AndroidRuntime(532): FATAL EXCEPTION: main
03-14 16:46:25.288: E/AndroidRuntime(532): java.lang.IllegalStateException: Could not find a method onSwitchToggle(View) in the activity class com.example.sensor.MainActivity for onClick handler on view class android.widget.Switch with id 'switch1'
03-14 16:46:25.288: E/AndroidRuntime(532):  at android.view.View$1.onClick(View.java:3031)
03-14 16:46:25.288: E/AndroidRuntime(532):  at android.view.View.performClick(View.java:3511)
03-14 16:46:25.288: E/AndroidRuntime(532):  at android.widget.CompoundButton.performClick(CompoundButton.java:100)
03-14 16:46:25.288: E/AndroidRuntime(532):  at android.view.View$PerformClick.run(View.java:14105)
03-14 16:46:25.288: E/AndroidRuntime(532):  at android.os.Handler.handleCallback(Handler.java:605)
03-14 16:46:25.288: E/AndroidRuntime(532):  at android.os.Handler.dispatchMessage(Handler.java:92)
03-14 16:46:25.288: E/AndroidRuntime(532):  at android.os.Looper.loop(Looper.java:137)
03-14 16:46:25.288: E/AndroidRuntime(532):  at android.app.ActivityThread.main(ActivityThread.java:4424)
03-14 16:46:25.288: E/AndroidRuntime(532):  at java.lang.reflect.Method.invokeNative(Native Method)
03-14 16:46:25.288: E/AndroidRuntime(532):  at java.lang.reflect.Method.invoke(Method.java:511)
03-14 16:46:25.288: E/AndroidRuntime(532):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
03-14 16:46:25.288: E/AndroidRuntime(532):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
03-14 16:46:25.288: E/AndroidRuntime(532):  at dalvik.system.NativeStart.main(Native Method)
03-14 16:46:25.288: E/AndroidRuntime(532): Caused by: java.lang.NoSuchMethodException: onSwitchToggle [class android.view.View]
03-14 16:46:25.288: E/AndroidRuntime(532):  at java.lang.Class.getConstructorOrMethod(Class.java:460)
03-14 16:46:25.288: E/AndroidRuntime(532):  at java.lang.Class.getMethod(Class.java:915)
03-14 16:46:25.288: E/AndroidRuntime(532):  at android.view.View$1.onClick(View.java:3024)
03-14 16:46:25.288: E/AndroidRuntime(532):  ... 12 more
03-14 16:46:25.948: I/dalvikvm(532): threadid=3: reacting to signal 3
03-14 16:46:25.958: I/dalvikvm(532): Wrote stack traces to '/data/anr/traces.txt'

Answer 1

如日志中所示:

NoSuchMethodException: onSwitchToggle [class android.view.View]

表示您在 Switch View xml 中添加了 android:onClick="onSwitchToggle" 属性，但您忘记在 Activity 中定义该方法> 代码。

因为你是在Activity中添加setOnCheckedChangeListener()到SwitchView，所以不需要设置onClick() 在 Switch View 的 XML 中。只需从 XML 中删除 android:onClick="onSwitchToggle" 属性即可。