我是编程的新手,我正在尝试设计一个简单的数学游戏.. 因为我想有一个方法,它将在3秒后将文本设置为textview,如果点击任何按钮,则必须取消计时器。我尝试了这个,但它没有工作...任何帮助将不胜感激 为我糟糕的变量命名,
public class MainActivity extends Activity implements OnClickListener {
Button b1, b2, b3;
ImageView i, i2, i3;
TextView t1, t2, t3;
String s1, s2, s3, s4, s5;
Button bk;
int q, m, r2, r3, r4, r5, r6, r7, r8, r9, r10, r11, r12, r13, n[];
Random r1 = new Random();
Random r0 = new Random();
Timer t = new Timer();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
b1 = (Button) findViewById(R.id.button1);
b2 = (Button) findViewById(R.id.button2);
b3 = (Button) findViewById(R.id.button3);
i = (ImageView) findViewById(R.id.imageView1);
t1 = (TextView) findViewById(R.id.textView1);
t2 = (TextView) findViewById(R.id.textView2);
t3 = (TextView) findViewById(R.id.textView3);
b1.setOnClickListener(this);
b2.setOnClickListener(this);
b3.setOnClickListener(this);
imp();
}
public void imp() {
t.schedule(new TimerTask() {
public void run() {
t3.setText("times up");
t3.setVisibility(View.VISIBLE);
}
}, 3000);
r2 = r1.nextInt(9) + 1;
r3 = r1.nextInt(9) + 1;
r4 = r2 + r3;
r5 = r2 - r3;
r6 = r2 * r3;
n = new int[] { r4, r5, r6 };
doit();
while (r9 == r11 || r9 == r13 || r11 == r13) {
doit();
}
s1 = Integer.toString(r2);
s2 = Integer.toString(r3);
s3 = Integer.toString(r9);
s4 = Integer.toString(r11);
s5 = Integer.toString(r13);
t1.setText(s1);
t2.setText(s2);
b1.setText(s3);
b2.setText(s4);
b3.setText(s5);
int[] images = { R.drawable.plus, R.drawable.minus, R.drawable.multiply };
Random random = new Random();
m = images[random.nextInt(images.length)];
i.setImageResource(m);
bk.setFocusable(true);
bk.requestFocus();
bk.requestFocusFromTouch();
}
public void doit() {
r9 = 0;
r11 = 0;
r13 = 0;
r8 = r1.nextInt(3) + 0;
r9 = n[r8];
r10 = r1.nextInt(3) + 0;
r11 = n[r10];
r12 = r1.nextInt(3) + 0;
r13 = n[r12];
int[] buttons = { R.id.button1, R.id.button2, R.id.button3 };
q = buttons[r0.nextInt(buttons.length)];
bk = (Button) findViewById(q);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.button1:
click(r9, b1);
break;
case R.id.button2:
click(r11, b2);
break;
case R.id.button3:
click(r13, b3);
break;
}
}
public void click(int k, Button b) {
if (m == R.drawable.plus && k == r4 || m == R.drawable.minus && k == r5 || m == R.drawable.multiply && k == r6) {
t.cancel();
imp();
} else {
t3.setText("FINISH");
t3.setVisibility(View.VISIBLE);
b.setPressed(true);
b1.setClickable(false);
b2.setClickable(false);
b3.setClickable(false);
b.requestFocusFromTouch();
}
}
}
和布局是`
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center_horizontal|center_vertical"
android:orientation="vertical" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TextView
android:textSize="30dp"
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="46dp"
android:layout_weight="0.97"
android:editable="false"
android:text="Large Text"
android:gravity="right"
android:textAppearance="?android:attr/textAppearanceLarge" />
<ImageView
android:layout_weight="1"
android:id="@+id/imageView1"
android:layout_width="67dp"
android:layout_height="29dp"
android:src="@drawable/plus" />
<TextView
android:textSize="30dp"
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_weight="1.00"
android:text="Large Text"
android:gravity="left"
android:textAppearance="?android:attr/textAppearanceLarge" />
</LinearLayout>
<LinearLayout
android:id="@+id/pooka"
android:paddingTop="100dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<Button
android:layout_weight="1"
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button" />
<Button
android:layout_weight="1"
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button" />
<Button
android:layout_weight="1"
android:id="@+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button" />
</LinearLayout>
<TextView
android:id="@+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingTop="50dp"
android:text="Large Text"
android:textAppearance="?android:attr/textAppearanceLarge"
android:textSize="50sp"
android:visibility="invisible"/>
</LinearLayout>
从答案中做出更改后,现在我遇到了onclick的问题, 这里是我的logcat报告
`04-03 05:11:14.084: E/AndroidRuntime(9317): FATAL EXCEPTION: main
04-03 05:11:14.084: E/AndroidRuntime(9317): java.lang.IllegalStateException: Timer was canceled
04-03 05:11:14.084: E/AndroidRuntime(9317): at java.util.Timer.scheduleImpl(Timer.java:561)
04-03 05:11:14.084: E/AndroidRuntime(9317): at java.util.Timer.schedule(Timer.java:459)
04-03 05:11:14.084: E/AndroidRuntime(9317): at com.example.emo2.MainActivity.imp(MainActivity.java:56)
04-03 05:11:14.084: E/AndroidRuntime(9317): at com.example.emo2.MainActivity.click(MainActivity.java:146)
04-03 05:11:14.084: E/AndroidRuntime(9317): at com.example.emo2.MainActivity.onClick(MainActivity.java:134)
04-03 05:11:14.084: E/AndroidRuntime(9317): at android.view.View.performClick(View.java:4212)
04-03 05:11:14.084: E/AndroidRuntime(9317): at android.view.View$PerformClick.run(View.java:17476)
04-03 05:11:14.084: E/AndroidRuntime(9317): at android.os.Handler.handleCallback(Handler.java:800)
04-03 05:11:14.084: E/AndroidRuntime(9317): at android.os.Handler.dispatchMessage(Handler.java:100)
04-03 05:11:14.084: E/AndroidRuntime(9317): at android.os.Looper.loop(Looper.java:194)
04-03 05:11:14.084: E/AndroidRuntime(9317): at android.app.ActivityThread.main(ActivityThread.java:5371)
04-03 05:11:14.084: E/AndroidRuntime(9317): at java.lang.reflect.Method.invokeNative(Native Method)
04-03 05:11:14.084: E/AndroidRuntime(9317): at java.lang.reflect.Method.invoke(Method.java:525)
04-03 05:11:14.084: E/AndroidRuntime(9317): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:833)
04-03 05:11:14.084: E/AndroidRuntime(9317): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
04-03 05:11:14.084: E/AndroidRuntime(9317): at dalvik.system.NativeStart.main(Native Method)
` 等待解决方案......
答案 0 :(得分:2)
您无法从非主线程更新UI /视图元素。必须在UI线程上对textView
进行更新。以下应该有效:
使用以下内容替换run()
方法的内容:
runOnUiThread(new Runnable() {
public void run() {
t3.setText("times up");
t3.setVisibility(View.VISIBLE);
}
});