android开发中动态添加EditText控件的方法

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一、基本步骤

1、定义一个RelativeLayout对象

1. private RelativeLayout rlActivityMain;

2、定义一个EditText对象并将其初始化

1. private EditText etIntroductImage;

1. etIntroductImage=new EditText(MainActivity.this);
2. etIntroductImage.setText("图片说明");

3、定义一个RelativeLayout.LayoutParams对象并将其初始化

1. private RelativeLayout.LayoutParams tempLayoutParams;

1. tempLayoutParams=new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, 90);//ViewGroup.LayoutParams.WRAP_CONTENT是要添加控件的width属性的值，90是要添加控件的height属性的值

4、设置EditText控件的位置

1. //imgFengJing的定义为private ImageView imgFengJing;
2. //将EditText放在imgFengJing上方水平居中的位置
3. tempLayoutParams.addRule(RelativeLayout.ABOVE, imgFengJing.getId());
4. tempLayoutParams.addRule(RelativeLayout.CENTER_HORIZONTAL,imgFengJing.getId());

5、将EditText添加到布局中

1. rlActivityMain.addView(etIntroductImage, tempLayoutParams);

二、效果图

三、源代码

MainActivity.java

1. package com.weipeng.adroid.myrelativelayout;
2.  
3. import android.os.Bundle;
4. import android.app.Activity;
5. import android.view.Menu;
6. import android.view.View;
7. import android.view.View.OnClickListener;
8. import android.view.ViewGroup;
9. import android.widget.Button;
10. import android.widget.EditText;
11. import android.widget.ImageView;
12. import android.widget.RelativeLayout;
13. import android.widget.RelativeLayout.LayoutParams;
14. import android.widget.TextView;
15.  
16. public class MainActivity extends Activity implements OnClickListener {
17.  
20. private Button btnUp;
21. private Button btnDown;
22. private Button btnLeft;
23. private Button btnRight;
25. int[] Buttons;
27. private ImageView imgFengJing;
29. private EditText etIntroductImage;
31. private RelativeLayout rlActivityMain;
33. private RelativeLayout.LayoutParams tempLayoutParams;
35. @Override
36. protected void onCreate(Bundle savedInstanceState) {
37. super.onCreate(savedInstanceState);
38. setContentView(R.layout.activity_main);
39. System.out.println("已执行：setContentView");
41. btnUp=(Button) findViewById(R.id.btnUp);
42. btnDown=(Button) findViewById(R.id.btnDown);
43. btnLeft=(Button) findViewById(R.id.btnLeft);
44. btnRight=(Button) findViewById(R.id.btnRight);
45. System.out.println("已执行：(Button) findViewById");
46. rlActivityMain=(RelativeLayout) findViewById(R.id.rlActivityMain);
47. imgFengJing=(ImageView) findViewById(R.id.imgFengJing);
48. System.out.println("已执行：(RelativeLayout) findViewById");
49. System.out.println("已执行：(ImageView) findViewById");
51. btnUp.setOnClickListener(this);
52. btnDown.setOnClickListener(this);
53. btnLeft.setOnClickListener(this);
54. btnRight.setOnClickListener(this);
55. System.out.println("已执行：setOnClickListener");
58. }
59.  
60. @Override
61. public boolean onCreateOptionsMenu(Menu menu) {
62. getMenuInflater().inflate(R.menu.main, menu);
63. return true;
64. }
65.  
66. @Override
67. public void onClick(View v) {
70. etIntroductImage=new EditText(MainActivity.this);
71. etIntroductImage.setText("图片说明");
72. tempLayoutParams=new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, 90);
74. switch (v.getId()) {
75. case R.id.btnUp:
76. tempLayoutParams.addRule(RelativeLayout.ABOVE, imgFengJing.getId());
77. tempLayoutParams.addRule(RelativeLayout.CENTER_HORIZONTAL,imgFengJing.getId());
78. rlActivityMain.addView(etIntroductImage, tempLayoutParams);
79. break;
80. case R.id.btnDown:
81. tempLayoutParams.addRule(RelativeLayout.BELOW, imgFengJing.getId());
82. tempLayoutParams.addRule(RelativeLayout.CENTER_HORIZONTAL, imgFengJing.getId());
83. rlActivityMain.addView(etIntroductImage, tempLayoutParams);
84. break;
85. case R.id.btnLeft:
86. tempLayoutParams.addRule(RelativeLayout.LEFT_OF,imgFengJing.getId());
87. tempLayoutParams.addRule(RelativeLayout.CENTER_VERTICAL, imgFengJing.getId());
88. rlActivityMain.addView(etIntroductImage, tempLayoutParams);
89. break;
90. case R.id.btnRight:
91. tempLayoutParams.addRule(RelativeLayout.RIGHT_OF, imgFengJing.getId());
92. tempLayoutParams.addRule(RelativeLayout.CENTER_VERTICAL, imgFengJing.getId());
93. rlActivityMain.addView(etIntroductImage, tempLayoutParams);
94. break;
96. }
97. System.out.println("已执行：onClick");
98. }
99.  
100. }

activity_main_xml

1. <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
2.     xmlns:tools="http://schemas.android.com/tools"
3.     android:id="@+id/rlActivityMain"
4.     android:layout_width="match_parent"
5.     android:layout_height="match_parent"
6.     android:background="#ffa500" >
7.  
8.     <Button
9.         android:id="@+id/btnUp"
10.         android:layout_width="wrap_content"
11.         android:layout_height="wrap_content"
12.         android:layout_alignParentTop="true"
13.         android:layout_centerHorizontal="true"
14.         android:text="@string/上" />
15.  
16.     <Button
17.         android:id="@+id/btnDown"
18.         android:layout_width="wrap_content"
19.         android:layout_height="wrap_content"
20.         android:layout_alignParentBottom="true"
21.         android:layout_centerHorizontal="true"
22.         android:text="@string/下" />
23.  
24.     <Button
25.         android:id="@+id/btnLeft"
26.         android:layout_width="wrap_content"
27.         android:layout_height="wrap_content"
28.         android:layout_alignParentLeft="true"
29.         android:layout_centerVertical="true"
30.         android:text="@string/左" />
31.  
32.     <Button
33.         android:id="@+id/btnRight"
34.         android:layout_width="wrap_content"
35.         android:layout_height="wrap_content"
36.         android:layout_alignParentRight="true"
37.         android:layout_centerVertical="true"
38.         android:text="@string/右" />
39.  
40.     <ImageView
41.         android:id="@+id/imgFengJing"
42.         android:layout_width="33dp"
43.         android:layout_height="33dp"
44.         android:layout_centerInParent="true"
45.         android:src="@drawable/fengjing" />
46.  
47. </RelativeLayout>