Java 创建取消按钮时出错。有人能帮我吗?
我正在做一个简单的应用程序,你把你的名字,点击一个按钮,选择一个爱好,然后它返回到主布局你的名字和爱好在一起。我有一个问题,当我在“取消(取消)”按钮点击应用程序不断得到一个致命的错误。你认为它可能是什么 主要活动:Java 创建取消按钮时出错。有人能帮我吗?,java,android,eclipse,Java,Android,Eclipse,我正在做一个简单的应用程序,你把你的名字,点击一个按钮,选择一个爱好,然后它返回到主布局你的名字和爱好在一起。我有一个问题,当我在“取消(取消)”按钮点击应用程序不断得到一个致命的错误。你认为它可能是什么 主要活动: package com.example.holaamigos; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.view.Me
package com.example.holaamigos;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends Activity {
public final static String EXTRA_SALUDO = "com.example.holaamigos.SALUDO";
TextView txtfinal;
String saludo;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final EditText txtNombre = (EditText)findViewById(R.id.TxtNombre);
final Button btnHola = (Button)findViewById(R.id.BtnHola);
final CheckBox checkbox1 =(CheckBox)findViewById(R.id.checkBox1);
txtfinal=(TextView)findViewById(R.id.textView1);
checkbox1.setOnCheckedChangeListener(new OnCheckedChangeListener(){
@Override
public void onCheckedChanged(CompoundButton arg0,
boolean checked) {
if (checked)
{
Toast.makeText(checkbox1.getContext(), "Activo", Toast.LENGTH_LONG).show();
btnHola.setVisibility(0);
btnHola.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this, ActivitySaludo.class);
saludo = txtNombre.getText().toString();
intent.putExtra(EXTRA_SALUDO, saludo);
startActivityForResult(intent, 1);
}
});
}
else
{
Toast.makeText(checkbox1.getContext(), "Inactivo", Toast.LENGTH_SHORT).show();
btnHola.setVisibility(View.INVISIBLE);
}
}
});
}
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode == RESULT_OK);
String string= data.getStringExtra("HOBBY");
txtfinal.setText("Nombre:" + saludo + " " + "Hobby:" + string);
if (resultCode == RESULT_CANCELED){
}
}
@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;
}
}
活动萨卢多:
package com.example.holaamigos;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.Spinner;
import android.widget.TextView;
public class ActivitySaludo extends Activity {
String myspinner;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_saludo);
Intent intent = getIntent();
String saludo = intent.getStringExtra(MainActivity.EXTRA_SALUDO);
TextView txtCambiado = (TextView) findViewById(R.id.TxtSaludo);
txtCambiado.setText(getString(R.string.hola_saludo) + " " + saludo);
final Spinner spinner = (Spinner)findViewById(R.id.SpinnerSaludo);
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this, R.array.hobby, android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_item);
spinner.setAdapter(adapter);
spinner.setOnItemSelectedListener(new OnItemSelectedListener () {
@Override
public void onItemSelected(AdapterView<?> parent, View view,
int pos, long id) {
parent.getItemAtPosition(pos);
myspinner = spinner.getItemAtPosition(pos).toString();
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
//another call
}
});
final Button BtnAceptar=(Button) findViewById(R.id.buttonAceptar);
BtnAceptar.setOnClickListener(new OnClickListener (){
@Override
public void onClick(View v) {
Intent iboton = new Intent();
iboton.putExtra("HOBBY", myspinner);
setResult(RESULT_OK, iboton);
finish();
}
});
final Button BtnCancelar=(Button) findViewById(R.id.buttonCancelar);
BtnCancelar.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
Intent iboton2 = new Intent();
iboton2 = null;
setResult(RESULT_CANCELED, iboton2);
finish();
}
});
}
}
package com.example.holaamigos;
导入android.app.Activity;
导入android.content.Intent;
导入android.os.Bundle;
导入android.view.view;
导入android.view.view.OnClickListener;
导入android.widget.AdapterView;
导入android.widget.AdapterView.OnItemSelectedListener;
导入android.widget.ArrayAdapter;
导入android.widget.Button;
导入android.widget.Spinner;
导入android.widget.TextView;
公共类活动Saludo扩展活动{
线绳夹;
@凌驾
创建时的公共void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_saludo);
Intent=getIntent();
String saludo=intent.getStringExtra(MainActivity.EXTRA\u saludo);
TextView txtCambiado=(TextView)findViewById(R.id.TxtSaludo);
txtCambiado.setText(getString(R.string.hola_saludo)+“”+saludo);
最终微调器微调器=(微调器)findViewById(R.id.SpinnerSaludo);
ArrayAdapter=ArrayAdapter.createFromResource(这个,R.array.hobby,android.R.layout.simple\u微调器\u项);
setDropDownViewResource(android.R.layout.simple\u微调器\u项);
旋转器。设置适配器(适配器);
微调器.setOnItemSelectedListener(新的OnItemSelectedListener(){
@凌驾
已选择公共视图(AdapterView父视图、视图、,
内部位置,长id){
父项。getItemAtPosition(pos);
myspinner=spinner.getItemAtPosition(pos.toString();
}
@凌驾
未选择公共无效(AdapterView arg0){
//另一个电话
}
});
最终按钮BtnAceptar=(按钮)findViewById(R.id.buttonAceptar);
BtnAceptar.setOnClickListener(新的OnClickListener(){
@凌驾
公共void onClick(视图v){
Intent iboton=新Intent();
iboton.putExtra(“爱好”,myspinner);
setResult(结果_OK,iboton);
完成();
}
});
最终按钮BtnCancelar=(按钮)findViewById(R.id.buttonCancelar);
setOnClickListener(新的OnClickListener(){
@凌驾
公共void onClick(视图v){
Intent ibotn2=新Intent();
iboton2=null;
setResult(结果_已取消,iboton2);
完成();
}
});
}
}
这就是错误所在。。您需要删除
代码>从if
语句的末尾开始,并将{
放在那里,同样地,用}
结束块。您需要发布您的logcat输出。没有看到它,我敢打赌你会在你的按钮上得到一个空指针,因为你在尝试使用它之前没有初始化它。底线…日志猫输出后。if(resultCode==RESULT\u OK)代码><代码>代码>,真的吗?
if (resultCode == RESULT_OK);
String string= data.getStringExtra("HOBBY");
txtfinal.setText("Nombre:" + saludo + " " + "Hobby:" + string);