package button.demo;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
//import android.view.View.OnClickListener;import android.widget.Button;import android.widget.LinearLayout;public class buttonact extends Activity {public Button btn; public Button btn1; public Button btn2; public Button btn3;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
btn=(Button)findViewById(R.id.next);
btn.setOnClickListener(new Button.OnClickListener(){
public void onClick(View view){
LinearLayout rellayout=new LinearLayout (buttonact.this);
setContentView(rellayout);
Button btn1 = new Button(buttonact.this);
btn1.setBackgroundResource(R.drawable.icon);
// btn1.setImageDrawable(dw1);
btn1.setText("电磁炉");
btn1.setId(1);
Button btn2 = new Button(buttonact.this);
btn2.setText("鸭梨");
btn2.setId(2);
LinearLayout.LayoutParams lp1 = new LinearLayout.LayoutParams(100,100,100);
LinearLayout.LayoutParams lp2 = new LinearLayout.LayoutParams(100,100,100);
rellayout.addView(btn1, lp1 );
rellayout.addView(btn2, lp2);
gongnengku ll = new gongnengku();
ll.SOCL();
}
});
}
}package button.demo;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.LinearLayout;public class gongnengku extends buttonact {/*** @param args* @return */private Button btn1;
public void SOCL(){ btn1.setOnClickListener(new OnClickListener(){
public void onClick(View v) {
LinearLayout lin=new LinearLayout(gongnengku.this);
setContentView(lin);
LinearLayout.LayoutParams lp3 = new LinearLayout.LayoutParams(100,100,100);
Button btn3 = new Button(gongnengku.this);
btn3.setText("开关");
btn3.setId(3);
lin.addView(btn3,lp3);}
});}
}
只要加入 gongnengku ll = new gongnengku();
ll.SOCL();
就会出现 stopped unexpectedly 的问题
这是logcat的报错。07-19 06:54:38.295: WARN/dalvikvm(254): threadid=3: thread exiting with uncaught exception (group=0x4001b188)
07-19 06:54:38.305: ERROR/AndroidRuntime(254): Uncaught handler: thread main exiting due to uncaught exception
07-19 06:54:38.315: ERROR/AndroidRuntime(254): java.lang.NullPointerException
07-19 06:54:38.315: ERROR/AndroidRuntime(254): at button.demo.gongnengku.SOCL(gongnengku.java:16)
07-19 06:54:38.315: ERROR/AndroidRuntime(254): at button.demo.buttonact$1.onClick(buttonact.java:43)
07-19 06:54:38.315: ERROR/AndroidRuntime(254): at android.view.View.performClick(View.java:2364)
07-19 06:54:38.315: ERROR/AndroidRuntime(254): at android.view.View.onTouchEvent(View.java:4179)
07-19 06:54:38.315: ERROR/AndroidRuntime(254): at android.widget.TextView.onTouchEvent(TextView.java:6541)
07-19 06:54:38.315: ERROR/AndroidRuntime(254): at android.view.View.dispatchTouchEvent(View.java:3709)
07-19 06:54:38.315: ERROR/AndroidRuntime(254): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
07-19 06:54:38.315: ERROR/AndroidRuntime(254): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
07-19 06:54:38.315: ERROR/AndroidRuntime(254): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
07-19 06:54:38.315: ERROR/AndroidRuntime(254): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
07-19 06:54:38.315: ERROR/AndroidRuntime(254): at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1659)
07-19 06:54:38.315: ERROR/AndroidRuntime(254): at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1107)
07-19 06:54:38.315: ERROR/AndroidRuntime(254): at android.app.Activity.dispatchTouchEvent(Activity.java:2061)
07-19 06:54:38.315: ERROR/AndroidRuntime(254): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1643)
07-19 06:54:38.315: ERROR/AndroidRuntime(254): at android.view.ViewRoot.handleMessage(ViewRoot.java:1691)
07-19 06:54:38.315: ERROR/AndroidRuntime(254): at android.os.Handler.dispatchMessage(Handler.java:99)
07-19 06:54:38.315: ERROR/AndroidRuntime(254): at android.os.Looper.loop(Looper.java:123)
07-19 06:54:38.315: ERROR/AndroidRuntime(254): at android.app.ActivityThread.main(ActivityThread.java:4363)
07-19 06:54:38.315: ERROR/AndroidRuntime(254): at java.lang.reflect.Method.invokeNative(Native Method)
07-19 06:54:38.315: ERROR/AndroidRuntime(254): at java.lang.reflect.Method.invoke(Method.java:521)
07-19 06:54:38.315: ERROR/AndroidRuntime(254): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
07-19 06:54:38.315: ERROR/AndroidRuntime(254): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
07-19 06:54:38.315: ERROR/AndroidRuntime(254): at dalvik.system.NativeStart.main(Native Method)求高手帮我解决下。
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
//import android.view.View.OnClickListener;import android.widget.Button;import android.widget.LinearLayout;public class buttonact extends Activity {public Button btn; public Button btn1; public Button btn2; public Button btn3;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
btn=(Button)findViewById(R.id.next);
btn.setOnClickListener(new Button.OnClickListener(){
public void onClick(View view){
LinearLayout rellayout=new LinearLayout (buttonact.this);
setContentView(rellayout);
Button btn1 = new Button(buttonact.this);
btn1.setBackgroundResource(R.drawable.icon);
// btn1.setImageDrawable(dw1);
btn1.setText("电磁炉");
btn1.setId(1);
Button btn2 = new Button(buttonact.this);
btn2.setText("鸭梨");
btn2.setId(2);
LinearLayout.LayoutParams lp1 = new LinearLayout.LayoutParams(100,100,100);
LinearLayout.LayoutParams lp2 = new LinearLayout.LayoutParams(100,100,100);
rellayout.addView(btn1, lp1 );
rellayout.addView(btn2, lp2);
gongnengku ll = new gongnengku();
ll.SOCL();
}
});
}
}package button.demo;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.LinearLayout;public class gongnengku extends buttonact {/*** @param args* @return */private Button btn1;
public void SOCL(){ btn1.setOnClickListener(new OnClickListener(){
public void onClick(View v) {
LinearLayout lin=new LinearLayout(gongnengku.this);
setContentView(lin);
LinearLayout.LayoutParams lp3 = new LinearLayout.LayoutParams(100,100,100);
Button btn3 = new Button(gongnengku.this);
btn3.setText("开关");
btn3.setId(3);
lin.addView(btn3,lp3);}
});}
}
只要加入 gongnengku ll = new gongnengku();
ll.SOCL();
就会出现 stopped unexpectedly 的问题
这是logcat的报错。07-19 06:54:38.295: WARN/dalvikvm(254): threadid=3: thread exiting with uncaught exception (group=0x4001b188)
07-19 06:54:38.305: ERROR/AndroidRuntime(254): Uncaught handler: thread main exiting due to uncaught exception
07-19 06:54:38.315: ERROR/AndroidRuntime(254): java.lang.NullPointerException
07-19 06:54:38.315: ERROR/AndroidRuntime(254): at button.demo.gongnengku.SOCL(gongnengku.java:16)
07-19 06:54:38.315: ERROR/AndroidRuntime(254): at button.demo.buttonact$1.onClick(buttonact.java:43)
07-19 06:54:38.315: ERROR/AndroidRuntime(254): at android.view.View.performClick(View.java:2364)
07-19 06:54:38.315: ERROR/AndroidRuntime(254): at android.view.View.onTouchEvent(View.java:4179)
07-19 06:54:38.315: ERROR/AndroidRuntime(254): at android.widget.TextView.onTouchEvent(TextView.java:6541)
07-19 06:54:38.315: ERROR/AndroidRuntime(254): at android.view.View.dispatchTouchEvent(View.java:3709)
07-19 06:54:38.315: ERROR/AndroidRuntime(254): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
07-19 06:54:38.315: ERROR/AndroidRuntime(254): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
07-19 06:54:38.315: ERROR/AndroidRuntime(254): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
07-19 06:54:38.315: ERROR/AndroidRuntime(254): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
07-19 06:54:38.315: ERROR/AndroidRuntime(254): at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1659)
07-19 06:54:38.315: ERROR/AndroidRuntime(254): at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1107)
07-19 06:54:38.315: ERROR/AndroidRuntime(254): at android.app.Activity.dispatchTouchEvent(Activity.java:2061)
07-19 06:54:38.315: ERROR/AndroidRuntime(254): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1643)
07-19 06:54:38.315: ERROR/AndroidRuntime(254): at android.view.ViewRoot.handleMessage(ViewRoot.java:1691)
07-19 06:54:38.315: ERROR/AndroidRuntime(254): at android.os.Handler.dispatchMessage(Handler.java:99)
07-19 06:54:38.315: ERROR/AndroidRuntime(254): at android.os.Looper.loop(Looper.java:123)
07-19 06:54:38.315: ERROR/AndroidRuntime(254): at android.app.ActivityThread.main(ActivityThread.java:4363)
07-19 06:54:38.315: ERROR/AndroidRuntime(254): at java.lang.reflect.Method.invokeNative(Native Method)
07-19 06:54:38.315: ERROR/AndroidRuntime(254): at java.lang.reflect.Method.invoke(Method.java:521)
07-19 06:54:38.315: ERROR/AndroidRuntime(254): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
07-19 06:54:38.315: ERROR/AndroidRuntime(254): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
07-19 06:54:38.315: ERROR/AndroidRuntime(254): at dalvik.system.NativeStart.main(Native Method)求高手帮我解决下。
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private Button btn1;
public void SOCL(){
btn1.setOnClickListener(new OnClickListener(){
}
里面的方法只有这句不报错
LinearLayout.LayoutParams lp3 = new LinearLayout.LayoutParams(100,100,100);
Button btn2 = new Button(buttonact.this);Button btn3 = new Button(buttonact.this);按钮!而你全局变量又没初始化,肯定抛空指针!