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每當我聲明對話框內的按鈕時，當我啓動對話時，應用程序崩潰。 如果我刪除了btn2.OnClickListener及其中的所有內容，對話框就會啓動。 任何人有任何想法？在對話崩潰時設置按鈕
package com.uia.examenno1;
import android.os.Bundle;
import android.app.Activity;
import android.app.Dialog;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends Activity {
Dialog d1;
Integer r1, r2, vol, vot;
EditText ed1;
TextView txt1, txt2, txt3, txt4;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button btn1= (Button) findViewById(R.id.button1);
Button btn3= (Button) findViewById(R.id.button3);
Button btn4= (Button) findViewById(R.id.button4);
Button btn5= (Button) findViewById(R.id.button5);
final Button btn2 = (Button) findViewById(R.id.button2);
final TextView txt1= (TextView) findViewById(R.id.textView1);
final TextView txt2= (TextView) findViewById(R.id.textView2);
final TextView txt3= (TextView) findViewById(R.id.textView3);
final TextView txt4=(TextView) findViewById(R.id.textView4);
final int r1= Integer.valueOf(1000);
final int r2 =Integer.valueOf(1000);
final int vol=Integer.valueOf(10);
final EditText ed1 = (EditText) findViewById(R.id.editText1);
final Dialog d1 = new Dialog(MainActivity.this);
btn1.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View arg0) {
d1.setContentView(R.layout.valor);
d1.setTitle("Valor de R1");
d1.show();
btn2.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
//TODO Auto-generated method stub
try{
int r1 =Integer.parseInt(ed1.getText().toString());
txt1.setText(ed1.getText());}
catch(NumberFormatException nfe)
{
nfe.printStackTrace();
}
d1.dismiss();
};
});
}
});
btn3.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View arg0) {
d1.setContentView(R.layout.valor);
d1.setTitle("Valor de R2");
d1.show();
btn2.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
int r2=Integer.parseInt(ed1.getText().toString());
txt2.setText(String.valueOf(r2));
d1.dismiss();
};
});
}
});
btn4.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View arg0) {
d1.setContentView(R.layout.valor);
d1.setTitle("Valor de V");
d1.show();
btn2.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
int vol=Integer.parseInt(ed1.getText().toString());
txt3.setText(String.valueOf(vol));
d1.dismiss();
};
});
}
});
btn5.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
vot=(r2/(r1+r2))*vol;
txt4.setText("Resultado: " +String.valueOf(vot));
};
});}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
LOG：
03-12 23:23:28.096: D/dalvikvm(17866): GC_FOR_ALLOC freed 1398K, 19% free 12719K/15612K, paused 10ms, total 10ms
03-12 23:23:29.921: D/AndroidRuntime(17866): Shutting down VM
03-12 23:23:29.921: W/dalvikvm(17866): threadid=1: thread exiting with uncaught exception (group=0x41d11700)
03-12 23:23:29.921: E/AndroidRuntime(17866): FATAL EXCEPTION: main
03-12 23:23:29.921: E/AndroidRuntime(17866): java.lang.NullPointerException
03-12 23:23:29.921: E/AndroidRuntime(17866): at
com.uia.examenno1.MainActivity$1.onClick(MainActivity.java:49)
03-12 23:23:29.921: E/AndroidRuntime(17866): at android.view.View.performClick(View.java:4489)
03-12 23:23:29.921: E/AndroidRuntime(17866): at android.view.View$PerformClick.run(View.java:18803)
03-12 23:23:29.921: E/AndroidRuntime(17866): at android.os.Handler.handleCallback(Handler.java:730)
03-12 23:23:29.921: E/AndroidRuntime(17866): at android.os.Handler.dispatchMessage(Handler.java:92)
03-12 23:23:29.921: E/AndroidRuntime(17866): at android.os.Looper.loop(Looper.java:137)
03-12 23:23:29.921: E/AndroidRuntime(17866): at android.app.ActivityThread.main(ActivityThread.java:5493)
03-12 23:23:29.921: E/AndroidRuntime(17866): at java.lang.reflect.Method.invokeNative(Native Method)
03-12 23:23:29.921: E/AndroidRuntime(17866): at java.lang.reflect.Method.invoke(Method.java:525)
03-12 23:23:29.921: E/AndroidRuntime(17866): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1209)
03-12 23:23:29.921: E/AndroidRuntime(17866): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1025)
03-12 23:23:29.921: E/AndroidRuntime(17866): at dalvik.system.NativeStart.main(Native Method)
03-12 23:23:32.351: I/Process(17866): Sending signal. PID: 17866 SIG: 9
可以把你的崩潰日誌？ – Sushil
您正在定義btn2 – user8938
您需要定義'btn2'和'edt1'。 –