java在安卓代码中将手机置于振动模式

Question

我试图在安卓中激活vibrate，但每次按下按钮，应用程序就会崩溃

silet.setRingerMode(AudioManager.RINGER_MODE_VIBRATE)

我也做了重要的事情。 并宣布：

public AudioManager silent;

日志：

07-13 22:06:17.956: E/AndroidRuntime(11925): FATAL EXCEPTION: main
07-13 22:06:17.956: E/AndroidRuntime(11925): java.lang.IllegalStateException: Could not execute method of the activity
07-13 22:06:17.956: E/AndroidRuntime(11925):    at 安卓.view.View$1.onClick(View.java:2072)
07-13 22:06:17.956: E/AndroidRuntime(11925):    at 安卓.view.View.performClick(View.java:2408)
07-13 22:06:17.956: E/AndroidRuntime(11925):    at 安卓.view.View$PerformClick.run(View.java:8816)
07-13 22:06:17.956: E/AndroidRuntime(11925):    at 安卓.os.Handler.handleCallback(Handler.java:587)
07-13 22:06:17.956: E/AndroidRuntime(11925):    at 安卓.os.Handler.dispatchMessage(Handler.java:92)
07-13 22:06:17.956: E/AndroidRuntime(11925):    at 安卓.os.Looper.loop(Looper.java:123)
07-13 22:06:17.956: E/AndroidRuntime(11925):    at 安卓.app.ActivityThread.main(ActivityThread.java:4627)
07-13 22:06:17.956: E/AndroidRuntime(11925):    at java.lang.reflect.Method.invokeNative(Native Method)
07-13 22:06:17.956: E/AndroidRuntime(11925):    at java.lang.reflect.Method.invoke(Method.java:521)
07-13 22:06:17.956: E/AndroidRuntime(11925):    at com.安卓.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
07-13 22:06:17.956: E/AndroidRuntime(11925):    at com.安卓.internal.os.ZygoteInit.main(ZygoteInit.java:626)
07-13 22:06:17.956: E/AndroidRuntime(11925):    at dalvik.system.NativeStart.main(Native Method)
07-13 22:06:17.956: E/AndroidRuntime(11925): Caused by: java.lang.reflect.InvocationTargetException
07-13 22:06:17.956: E/AndroidRuntime(11925):    at com.安卓.hello.MainActivity.click(MainActivity.java:25)
07-13 22:06:17.956: E/AndroidRuntime(11925):    at java.lang.reflect.Method.invokeNative(Native Method)
07-13 22:06:17.956: E/AndroidRuntime(11925):    at java.lang.reflect.Method.invoke(Method.java:521)
07-13 22:06:17.956: E/AndroidRuntime(11925):    at 安卓.view.View$1.onClick(View.java:2067)
07-13 22:06:17.956: E/AndroidRuntime(11925):    ... 11 more
07-13 22:06:17.956: E/AndroidRuntime(11925): Caused by: java.lang.NullPointerException

Answer 1

我在猜测，但你宣称：

public AudioManager silent;

您是否已使用以下命令初始化它：

AudioManager silent = (AudioManager) getSystemService(AUDIO_SERVICE);

你在这里拼写silent错了：

silent.setRingerMode(AudioManager.RINGER_MODE_VIBRATE);
//silet.setRingerMode(AudioManager.RINGER_MODE_VIBRATE);

Answer 2

试试这段代码，它会帮你的

       AudioManager audio = (AudioManager) getSystemService(Context.AUDIO_SERVICE);

       audio.setRingerMode(AudioManager.RINGER_MODE_VIBRATE);

需要在AndroidManifest中添加权限。xml

 <uses-permission android:name="android.permission.VIBRATE"/>

享受