Question

我在Android中设计了一个简单的应用程序但是当我在模拟器上运行时它显示应用程序已停止...我试图找到解决方案并遇到使用断点...但是当我放置断点并调试应用程序时它显示“来源没有找到“在ddms透视

ActivityThread.performLaunchActivity(ActivityThread$ActivityRecord, Intent).

这里的任何人都可以建议我现在做什么......

这就是我的日志的样子

02-20 04:28:21.232: D/AndroidRuntime(607): Shutting down VM
02-20 04:28:21.232: W/dalvikvm(607): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
02-20 04:28:21.262: E/AndroidRuntime(607): FATAL EXCEPTION: main
02-20 04:28:21.262: E/AndroidRuntime(607): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.apps/com.example.apps.Act}: java.lang.NullPointerException
02-20 04:28:21.262: E/AndroidRuntime(607):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
02-20 04:28:21.262: E/AndroidRuntime(607):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
02-20 04:28:21.262: E/AndroidRuntime(607):  at android.app.ActivityThread.access$2300(ActivityThread.java:125)
02-20 04:28:21.262: E/AndroidRuntime(607):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
02-20 04:28:21.262: E/AndroidRuntime(607):  at android.os.Handler.dispatchMessage(Handler.java:99)
02-20 04:28:21.262: E/AndroidRuntime(607):  at android.os.Looper.loop(Looper.java:123)
02-20 04:28:21.262: E/AndroidRuntime(607):  at android.app.ActivityThread.main(ActivityThread.java:4627)
02-20 04:28:21.262: E/AndroidRuntime(607):  at java.lang.reflect.Method.invokeNative(Native Method)
02-20 04:28:21.262: E/AndroidRuntime(607):  at java.lang.reflect.Method.invoke(Method.java:521)
02-20 04:28:21.262: E/AndroidRuntime(607):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
02-20 04:28:21.262: E/AndroidRuntime(607):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
02-20 04:28:21.262: E/AndroidRuntime(607):  at dalvik.system.NativeStart.main(Native Method)
02-20 04:28:21.262: E/AndroidRuntime(607): Caused by: java.lang.NullPointerException
02-20 04:28:21.262: E/AndroidRuntime(607):  at com.example.apps.Act.onCreate(Act.java:16)
02-20 04:28:21.262: E/AndroidRuntime(607):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
02-20 04:28:21.262: E/AndroidRuntime(607):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
02-20 04:28:21.262: E/AndroidRuntime(607):  ... 11 more
02-20 04:28:31.283: I/Process(607): Sending signal. PID: 607 SIG: 9

活动类

package com.example.apps; 

import android.app.Activity; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.Button; 
import android.widget.EditText; 

public class Act extends Activity { 

    Rest r=new Rest(); 

@Override 
public void onCreate(Bundle savedInstanceState) {  
   super.onCreate(savedInstanceState); 
   Button save=(Button)findViewById(R.id.save); 
   save.setOnClickListener(onSave); 
} 

private View.OnClickListener onSave=new View.OnClickListener() { 

     public void onClick(View v) { 
         EditText name=(EditText)findViewById(R.id.name); 
         EditText address=(EditText)findViewById(R.id.addr);  
         r.setName(name.getText().toString());
         r.setAddress(address.getText().toString()); 
     }  
}; 

}

Answer 1

为了方便起见，让我们改变您的onClick()喜欢

save.setOnClickListener(new OnClickListener() {
 @Override
 public void onClick(View v) {
  // do stuff here
}
});

save是您的按钮。从现在开始，使用更新的代码编辑您的问题，以便更容易阅读。我在评论中阅读您的代码时遇到了问题，但看起来如果您这样更改它应该适合您。的 Here is a good discussion about the different ways to use onClick()

我打算删除，但这些信息可能有助于其他人。但是，正如@dymmeh setContentView()所指出的那样，没有调用，所以没有布局来获取你的按钮。这需要使用适当的布局R.layout.your_layout调用，然后才能引用任何视图，Buttons，EditText等等。

android ActivityThread.performLaunchActivity（ActivityThread $ ActivityRecord，Intent）

1 个答案: