我一直在尝试在Eclipse中制作我的第一个Android应用程序(一个简单的温度转换器),但当我点击手机上的按钮时,应用程序崩溃了。这是完整的java代码
package com.example.myfirstapp;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.Window;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.TextView;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
String number;
int number2;
int output;
boolean F;
public void onBtnClicked(View view){
EditText mEdit = (EditText)findViewById(R.id.editText1);
TextView myTextView = (TextView) findViewById(R.id.label);
number = mEdit.getText().toString();
number2 = Integer.parseInt(number);
if(F=true){
output=number2*9/5+32;
}
else{
output=number2-32*5/9;
}
myTextView.setText(output);
}
public void onRadioButtonClicked(View view) {
boolean checked = ((RadioButton) view).isChecked();
switch(view.getId()) {
case R.id.radio0:
if (checked)
F = true;
break;
case R.id.radio1:
if (checked)
F = false;
break;
}
}
}
单击按钮时的LogCat
04-13 20:19:50.423: E/AndroidRuntime(25200): FATAL EXCEPTION: main
04-13 20:19:50.423: E/AndroidRuntime(25200): java.lang.IllegalStateException: Could not execute method of the activity
04-13 20:19:50.423: E/AndroidRuntime(25200): at android.view.View$1.onClick(View.java:3674)
04-13 20:19:50.423: E/AndroidRuntime(25200): at android.view.View.performClick(View.java:4198)
04-13 20:19:50.423: E/AndroidRuntime(25200): at android.view.View$PerformClick.run(View.java:17158)
04-13 20:19:50.423: E/AndroidRuntime(25200): at android.os.Handler.handleCallback(Handler.java:615)
04-13 20:19:50.423: E/AndroidRuntime(25200): at android.os.Handler.dispatchMessage(Handler.java:92)
04-13 20:19:50.423: E/AndroidRuntime(25200): at android.os.Looper.loop(Looper.java:137)
04-13 20:19:50.423: E/AndroidRuntime(25200): at android.app.ActivityThread.main(ActivityThread.java:4918)
04-13 20:19:50.423: E/AndroidRuntime(25200): at java.lang.reflect.Method.invokeNative(Native Method)
04-13 20:19:50.423: E/AndroidRuntime(25200): at java.lang.reflect.Method.invoke(Method.java:511)
04-13 20:19:50.423: E/AndroidRuntime(25200): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1004)
04-13 20:19:50.423: E/AndroidRuntime(25200): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:771)
04-13 20:19:50.423: E/AndroidRuntime(25200): at dalvik.system.NativeStart.main(Native Method)
04-13 20:19:50.423: E/AndroidRuntime(25200): Caused by: java.lang.reflect.InvocationTargetException
04-13 20:19:50.423: E/AndroidRuntime(25200): at java.lang.reflect.Method.invokeNative(Native Method)
04-13 20:19:50.423: E/AndroidRuntime(25200): at java.lang.reflect.Method.invoke(Method.java:511)
04-13 20:19:50.423: E/AndroidRuntime(25200): at android.view.View$1.onClick(View.java:3669)
04-13 20:19:50.423: E/AndroidRuntime(25200): ... 11 more
04-13 20:19:50.423: E/AndroidRuntime(25200): Caused by: android.content.res.Resources$NotFoundException: String resource ID #0x59
04-13 20:19:50.423: E/AndroidRuntime(25200): at android.content.res.Resources.getText(Resources.java:242)
04-13 20:19:50.423: E/AndroidRuntime(25200): at android.widget.TextView.setText(TextView.java:3773)
04-13 20:19:50.423: E/AndroidRuntime(25200): at com.example.myfirstapp.MainActivity.onBtnClicked(MainActivity.java:43)
04-13 20:19:50.423: E/AndroidRuntime(25200): ... 14 more
04-13 20:19:50.453: E/android.os.Debug(718): !@Dumpstate > dumpstate -k -t -z -d -o /data/log/dumpstate_app_error
最后是按钮的xml
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/radioGroup1"
android:layout_centerHorizontal="true"
android:layout_marginTop="16dp"
android:onClick="onBtnClicked"
android:text="Calculate" />
我不知道如何解决这个问题,所以希望有人可以提供帮助。 感谢。
答案 0 :(得分:6)
首先初始化你的按钮,然后将onclicklistener设置为
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//initialize views here
EditText mEdit = (EditText)findViewById(R.id.editText1);
TextView myTextView = (TextView) findViewById(R.id.label);
Button yourButton=(Button)findViewByid(R.id.youridforbutton);
//set onclicklistener for your button
yourbutton.setOnClickListener(
new View.OnClickListener() {
@Override
public void onClick(View v) {
number = mEdit.getText().toString();
number2 = Integer.parseInt(number);
if(F=true){
output=number2*9/5+32;
}
else{
output=number2-32*5/9;
}
myTextView.setText(""+output);
}
});
}
同样设置另一个按钮
答案 1 :(得分:2)
您需要将输出转换为String
myTextView.setText(String.valueOf(output));
setText方法被重载,当你向它传递一个整数时,它期望它是一个资源的id。
答案 2 :(得分:0)
你需要告诉点击监听器听一个特定的按钮。因此,换句话说,在按钮上设置OnItemClickListener。如下:
Button button = (Button) findViewById(R.id.button1);
button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// do the "on click" action here
}
});
希望这会有所帮助。如果没有,那么请评论进一步的问题。
答案 3 :(得分:0)
您无法将整数设置为TextView。你必须将它们转换成字符串。
myTextView.setText(String.valueOf(output));