我是android的新手,我想知道当我点击button1时如何制作,然后button2文本视图将显示1 2 ,,,但如果我点击button2然后button1它将显示2 1
这是我的代码但现在当我点击button1然后按钮2,或者如果我点击button2然后button1它显示相同的,, 请帮助我 感谢名单。
现在我使用getText& setText它按照我的意愿工作,但条件是否正确或不正常工作PLZ帮助!!有什么问题,我的方法是否正确?
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setRequestedOrientation (ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
// Full screen
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.wordgame2);
bu1 = (Button) findViewById(R.id.bu1);
bu2 = (Button) findViewById(R.id.bu2);
bu3 = (Button) findViewById(R.id.bu3);
bu4 = (Button) findViewById(R.id.bu4);
bu5 = (Button) findViewById(R.id.bu5);
t1 = (TextView) findViewById(R.id.t1);
i1 = (ImageView) findViewById(R.id.i1);
i2 = (ImageView) findViewById(R.id.i2);
bu1.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
t1.setText(t1.getText()+" "+bu1.getText());
}
});
bu2.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
t1.setText(t1.getText()+" "+bu2.getText());
}
});
bu3.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
t1.setText(t1.getText()+" "+bu3.getText());
}
});
bu4.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
t1.setText(t1.getText()+" "+bu4.getText());
}
});
bu5.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
if(t1.getText().toString().equals("a b c d")) //this is not working
{
i1.setVisibility(View.VISIBLE);
i2.setVisibility(View.INVISIBLE);
}
else {
i2.setVisibility(View.VISIBLE);
i1.setVisibility(View.INVISIBLE);
}
}
});
}
04-21 07:00:48.690:E / AndroidRuntime(23874):致命异常:主要 04-21 07:00:48.690:E / AndroidRuntime(23874):java.lang.RuntimeException:无法启动活动ComponentInfo {com.arabicalphabets.reham / com.arabicalphabets.reham.Wordgame2}:java.lang.NullPointerException 04-21 07:00:48.690:E / AndroidRuntime(23874):在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1970) 04-21 07:00:48.690:E / AndroidRuntime(23874):在android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1995) 04-21 07:00:48.690:E / AndroidRuntime(23874):在android.app.ActivityThread.access $ 600(ActivityThread.java:127) 04-21 07:00:48.690:E / AndroidRuntime(23874):在android.app.ActivityThread $ H.handleMessage(ActivityThread.java:1161) 04-21 07:00:48.690:E / AndroidRuntime(23874):在android.os.Handler.dispatchMessage(Handler.java:99) 04-21 07:00:48.690:E / AndroidRuntime(23874):在android.os.Looper.loop(Looper.java:137) 04-21 07:00:48.690:E / AndroidRuntime(23874):在android.app.ActivityThread.main(ActivityThread.java:4512) 04-21 07:00:48.690:E / AndroidRuntime(23874):at java.lang.reflect.Method.invokeNative(Native Method) 04-21 07:00:48.690:E / AndroidRuntime(23874):at java.lang.reflect.Method.invoke(Method.java:511) 04-21 07:00:48.690:E / AndroidRuntime(23874):at com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:982) 04-21 07:00:48.690:E / AndroidRuntime(23874):at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:749) 04-21 07:00:48.690:E / AndroidRuntime(23874):at dalvik.system.NativeStart.main(Native Method) 04-21 07:00:48.690:E / AndroidRuntime(23874):引起:java.lang.NullPointerException 04-21 07:00:48.690:E / AndroidRuntime(23874):at com.arabicalphabets.reham.Wordgame2.onCreate(Wordgame2.java:36) 04-21 07:00:48.690:E / AndroidRuntime(23874):在android.app.Activity.performCreate(Activity.java:4465) 04-21 07:00:48.690:E / AndroidRuntime(23874):在android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1052) 04-21 07:00:48.690:E / AndroidRuntime(23874):在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1934) 04-21 07:00:48.690:E / AndroidRuntime(23874):... 11更多
答案 0 :(得分:0)
首先而不是声明每个按钮单独使用循环来声明它们......
Button[] buttons;
for(int i=0; i<5; i++) { //for your 5 buttons
{
String buttonID = "bu" + (i+1);
int resID = getResources().getIdentifier(buttonID, "id", getPackageName());
buttons[i] = ((Button) findViewById(resID));
}
- 使用开关()找到点击的按钮......
- 并且在案例中实施onclick()
如下
public void onClick(View v) {
t1.setText(t1.getText().toString()+" "+buttons[i].getText().toString());
}
希望它有效
答案 1 :(得分:0)
我看不出它有什么问题,为什么它崩溃以及为什么if else
声明不起作用...... ??
public class Wordgame2 extends Activity implements OnClickListener {
Button[] buttons;
TextView t1;
ImageView i1, i2;
int i;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setRequestedOrientation (ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
// Full screen
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.wordgame2);
for(int i=0; i<5; i++) {
{
String buttonID = "bu" + (i+1);
int resID = getResources().getIdentifier(buttonID, "id", getPackageName());
buttons[i] = ((Button) findViewById(resID));
buttons[i].setOnClickListener(this);
}
}
t1 = (TextView) findViewById(R.id.t1);
i1 = (ImageView) findViewById(R.id.i1);
i2 = (ImageView) findViewById(R.id.i2);
}
public void onClick(View v) {
// TODO Auto-generated method stub
switch (v.getId()){
case R.id.bu1:
t1.setText(t1.getText().toString()+" "+buttons[i].getText().toString());
break;
case R.id.bu2:
t1.setText(t1.getText().toString()+" "+buttons[i].getText().toString());
break;
case R.id.bu3:
t1.setText(t1.getText().toString()+" "+buttons[i].getText().toString());
break;
case R.id.bu4:
t1.setText(t1.getText().toString()+" "+buttons[i].getText().toString());
break;
//当他们点击bu5时,如果t1正确为“a b c d”,它将显示图片
case R.id.bu5:
if(t1.getText().toString().equals("a b c d")) //this is not working
{
i1.setVisibility(View.VISIBLE);
i2.setVisibility(View.INVISIBLE);
}
else {
i2.setVisibility(View.VISIBLE);
i1.setVisibility(View.INVISIBLE);
}
break;
}
}
}