Android 设置两个OnClickListener时应用程序强制关闭
下面的所有代码都可以正常工作。也就是说,直到我尝试将第二个onclick侦听器添加到另一个图像。我试图添加的代码,以及我试图添加它的位置,在下面的代码中列为注释。有人看到我遗漏的东西了吗?我觉得这个额外的实现不应该有任何问题 公共类MainActivity扩展了活动{Android 设置两个OnClickListener时应用程序强制关闭,android,onclick,listeners,Android,Onclick,Listeners,下面的所有代码都可以正常工作。也就是说,直到我尝试将第二个onclick侦听器添加到另一个图像。我试图添加的代码,以及我试图添加它的位置,在下面的代码中列为注释。有人看到我遗漏的东西了吗?我觉得这个额外的实现不应该有任何问题 公共类MainActivity扩展了活动{ ImageView mImage; //ImageView journal; @Override protected void onCreate(Bundle savedInstanceState) { super.on
ImageView mImage;
//ImageView journal;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mImage = (ImageView)MainActivity.this.findViewById(R.id.Floaterimg);
//journal = (ImageView)MainActivity.this.findViewById(R.id.journbtn);
//journal.setOnClickListener(new View.OnClickListener() {
//@Override
//public void onClick (View v) {
//Intent i = new Intent(MainActivity.this,
//SecondActivity.class);
//startActivity(i);
//}
//});
final Handler randomizer = new Handler();
final Runnable rrandomizer = new Runnable() {
public void run() {
RelativeLayout.LayoutParams params = new
LayoutParams(LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT);
params.topMargin = (int)(Math.random()*2000 + 1);
params.leftMargin = (int)(Math.random()*3000 + 1);
mImage.setLayoutParams(params);
randomizer.postDelayed(this, 5000);
}
};
rrandomizer.run();
mImage.setOnClickListener(new View.OnClickListener() {
int numClicks = 0;
@Override
public void onClick(View arg0) {
numClicks++;
if(numClicks > 5) {
Bitmap bitmap =
BitmapFactory.decodeResource(getResources(),
R.drawable.ic_launcher);
ByteArrayOutputStream baos = new
ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.PNG, 100, baos);
byte[] b = baos.toByteArray();
Intent intent = new Intent(MainActivity.this,
SecondActivity.class);
intent.putExtra("picture", b);
}
}
});
}
})
编辑:
按下按钮后,logcat出现错误:
10-18 14:17:32.529: E/InputDispatcher(17677): Event_report_payload: Failed to write keypress event to kernel, error = 5
10-18 14:17:32.529: E/dhcpcd(7483): open_udp_socket: No such device
10-18 14:17:32.549: E/dhcpcd(7483): open_socket: No such file or directory
10-18 14:17:32.549: E/dhcpcd(7483): send_raw_packet: No such file or directory
10-18 14:17:32.609: E/InputDispatcher(17677): Event_report_payload: Failed to write keypress event to kernel, error = 5
10-18 14:17:32.759: E/AndroidRuntime(26780): Uncaught handler: thread main exiting due to uncaught exception
10-18 14:17:32.759: E/Monkey(26780): exception :java.io.FileNotFoundException: /dev/kmsg (Permission denied)
10-18 14:17:32.809: E/AndroidRuntime(26780): exception :java.io.FileNotFoundException: /dev/kmsg (Permission denied)
10-18 14:17:32.809: E/AndroidRuntime(26780): FATAL EXCEPTION: main
10-18 14:17:32.809: E/AndroidRuntime(26780): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.test/com.example.test.SecondActivity}: java.lang.NullPointerException
10-18 14:17:32.809: E/AndroidRuntime(26780): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1664)
10-18 14:17:32.809: E/AndroidRuntime(26780): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1680)
10-18 14:17:32.809: E/AndroidRuntime(26780): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
10-18 14:17:32.809: E/AndroidRuntime(26780): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:945)
10-18 14:17:32.809: E/AndroidRuntime(26780): at android.os.Handler.dispatchMessage(Handler.java:99)
10-18 14:17:32.809: E/AndroidRuntime(26780): at android.os.Looper.loop(Looper.java:130)
10-18 14:17:32.809: E/AndroidRuntime(26780): at android.app.ActivityThread.main(ActivityThread.java:3719)
10-18 14:17:32.809: E/AndroidRuntime(26780): at java.lang.reflect.Method.invokeNative(Native Method)
10-18 14:17:32.809: E/AndroidRuntime(26780): at java.lang.reflect.Method.invoke(Method.java:507)
10-18 14:17:32.809: E/AndroidRuntime(26780): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:895)
10-18 14:17:32.809: E/AndroidRuntime(26780): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:653)
10-18 14:17:32.809: E/AndroidRuntime(26780): at dalvik.system.NativeStart.main(Native Method)
10-18 14:17:32.809: E/AndroidRuntime(26780): Caused by: java.lang.NullPointerException
10-18 14:17:32.809: E/AndroidRuntime(26780): at com.example.inkuesttest.SecondActivity.onCreate(SecondActivity.java:18)
10-18 14:17:32.809: E/AndroidRuntime(26780): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
10-18 14:17:32.809: E/AndroidRuntime(26780): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1628)
10-18 14:17:32.809: E/AndroidRuntime(26780): ... 11 more
10-18 14:17:32.829: E/AndroidRuntime(26780): exception :java.io.FileNotFoundException: /dev/kmsg (Permission denied)
10-18 14:17:32.869: E/ActivityManager(17677): set systemprop back to original value~
编辑:
您的问题是,您试图访问
意图中的附加功能
,但没有传递任何附加功能。您可以在下面的意图中执行此操作,这就是为什么该方法有效
intent.putExtra("picture", b);
但在另一个onClick()
中不会这样做。您可以确保您正在发送附加信息
,或者为了安全起见,使用类似的方法执行null
检查您的SecondActivity
Bundle extras = getIntent().getExtras();
//line18
if (getIntent().getExtras() != null)
{
byte[] b = extras.getByteArray("picture");
}
@Override
public void onClick(View v) { // arg0 is an ugly name for a param so I changed it to v
switch (v.getId())
{
case (R.id.Floaterimg):
// do stuff if this image is clicked;
break;
case (R.id.journbtn):
// do stuff if this image is clicked;
break;
}
}
当然,如果它是null
,则需要处理下面的行
编辑
如果两个按钮
s通常执行相同的操作,则可以对这两个按钮使用相同的方法。然后,您只需在视图的id
上切换,即可根据单击的代码使用不同的代码。差不多
Bundle extras = getIntent().getExtras();
//line18
if (getIntent().getExtras() != null)
{
byte[] b = extras.getByteArray("picture");
}
@Override
public void onClick(View v) { // arg0 is an ugly name for a param so I changed it to v
switch (v.getId())
{
case (R.id.Floaterimg):
// do stuff if this image is clicked;
break;
case (R.id.journbtn):
// do stuff if this image is clicked;
break;
}
}
然后在开关
语句外部放置常见代码,如您的意图
。请包含LOGCAT输出或至少包含错误消息LOGCAT Produce。您是否仔细检查了journbtn
是否为ImageView的id
在activity\u main.xml
内部?另外,确保在manifest.xml
中声明了SecondActivity
。如果这些都不起作用,那么请发布你的坠机日志;在“意图”末尾(底部),第二个活动的启动没有问题。journbtn实际上是activity_main.xml中ImageView的id。我将在一秒钟内上传logcat。我已经用logcat的信息编辑了这个问题。。。尽管可能没有那么大帮助:\n取消注释导致问题的行,然后再次运行,然后获取完整日志如果我希望在单击另一个图像五次后将图片保存在那里,如在“其他意图”中所做的那样?还有,谢谢你的解释!如果对你有用的话,那么就使用与另一个相同的逻辑。如果我将位图过程放在第一个意图中,那么图像将始终存在。如何使图像永久存储在SecondActivity中,但仅在按下第二个按钮5次后才存储?我还在编辑答案时添加了一些额外的信息,可以帮助稍微清理代码。退出活动后,图像无法保留在那里。您还必须在其他活动中设置它。一旦退出活动
其视图
将被销毁