Android按鍵學習：Button的界面跳轉（Intent）

HelloActivity.java

1. package sg131971.hello;
3. import Android.app.Activity;
4. import android.content.Intent;
5. import android.os.Bundle;
6. import android.view.Gravity;
7. import android.view.View;
8. import android.view.View.OnClickListener;
9. import android.widget.Button;
10. import android.widget.RadioButton;
11. import android.widget.RadioGroup;
12. import android.widget.Toast;
13. import android.widget.RadioGroup.OnCheckedChangeListener;
15. public class HelloActivity extends Activity {
16. /** Called when the activity is first created. */
17. private RadioGroup group;
18. private RadioButton radio1,radio2,radio3,radio4;
19. private Button myButton;
20. @Override
21. public void onCreate(Bundle savedInstanceState) {
22. super.onCreate(savedInstanceState);
23. setContentView(R.layout.main);
25. group = (RadioGroup)findViewById(R.id.radiogroup);
26. radio1 = (RadioButton)findViewById(R.id.button1);
27. radio2 = (RadioButton)findViewById(R.id.button2);
28. radio3 = (RadioButton)findViewById(R.id.button3);
29. radio4 = (RadioButton)findViewById(R.id.button4);
30. myButton = (Button)findViewById(R.id.myButton);
32. group.setOnCheckedChangeListener(new AnswerListener());
33. myButton.setOnClickListener(new MyButtonListener());
34. }
36. class AnswerListener implements OnCheckedChangeListener {
38. public void onCheckedChanged(RadioGroup group, int checkedId) {
39. // TODO Auto-generated method stub
40. if (checkedId == radio2.getId())
41. {
42. showMessage("正確答案：" + radio2.getText()+".恭喜你，答對了!");
43. }
44. else if(checkedId == radio1.getId())
45. {
46. showMessage("對不起!" + radio1.getText()+"雖然很多,但不是公認的最多!");
47. }
48. else if(checkedId == radio3.getId())
49. {
50. showMessage("對不起!" + radio3.getText()+"雖然很多,但不是公認的最多!");
51. }
52. else
53. {
54. showMessage("對不起!" + radio4.getText()+"雖然很多,但不是公認的最多!");
55. }
56. }
57. }
59. class MyButtonListener implements OnClickListener {
61. public void onClick(View arg0) {
62. // TODO Auto-generated method stub
63. Intent intent = new Intent();
64. intent.setClass(HelloActivity.this, Second.class);
65. HelloActivity.this.startActivity(intent);
66. }
68. }
71. public void showMessage(String str)
72. {
73. Toast toast = Toast.makeText(this, str, Toast.LENGTH_SHORT);
74. toast.setGravity(Gravity.TOP, 0, 420);
75. toast.show();
76. }
77. }

1. <?xml version="1.0" encoding="utf-8"?>
2. <AbsoluteLayout xmlns:android="http://schemas.android.com/apk/res/android"
3. android:orientation="vertical"
4. android:layout_width="fill_parent"
5. android:layout_height="fill_parent"
6. android:background="@drawable/bg1"
7. >
8. <TextView android:text="哪個城市的美女最多？" android:textSize="30px" android:layout_height="wrap_content" android:id="@+id/mytextview" android:layout_width="fill_parent" android:textColor="#FF0000" android:layout_x="0dp" android:layout_y="80dp"></TextView>
9. <RadioGroup android:orientation="vertical" android:layout_height="wrap_content" android:layout_width="wrap_content" android:id="@+id/radiogroup" android:layout_x="0dp" android:layout_y="140dp">
10. <RadioButton android:layout_height="wrap_content" android:text="杭州" android:layout_width="wrap_content" android:id="@+id/button1"></RadioButton>
11. <RadioButton android:layout_height="wrap_content" android:text="重慶" android:layout_width="wrap_content" android:id="@+id/button2"></RadioButton>
12. <RadioButton android:layout_height="wrap_content" android:text="成都" android:layout_width="wrap_content" android:id="@+id/button3"></RadioButton>
13. <RadioButton android:layout_height="wrap_content" android:text="香港" android:layout_width="wrap_content" android:id="@+id/button4"></RadioButton>
14. </RadioGroup>
15. <Button android:id="@+id/myButton" android:layout_height="50dp" android:layout_width="205dp" android:text="@string/submit" android:layout_x="49dp" android:layout_y="345dp"></Button>
16. </AbsoluteLayout>
    Second.java