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一，概述
本篇博客总结一下自己在开发过程中应用到的一些知识，在本篇博客中带领大家完成用户头像选择或者拍照上传，并对图片进行大小的压缩，和形状的控制，可以将用户选择到的图片裁剪成圆形上传。
ok，我们开始写一个小的demo,完成用户圆形头像的选取，在写即将实现的效果之前我们看一下即将要实现的效果图
二，实现代码
activity_main.xml
<code class="language-xml hljs has-numbering"><span class="hljs-tag"><<span class="hljs-title">LinearLayout</span> <span class="hljs-attribute">xmlns:android</span>=<span class="hljs-value">"http://schemas.android.com/apk/res/android"</span>
<span class="hljs-attribute">xmlns:tools</span>=<span class="hljs-value">"http://schemas.android.com/tools"</span>
<span class="hljs-attribute">android:layout_width</span>=<span class="hljs-value">"match_parent"</span>
<span class="hljs-attribute">android:layout_height</span>=<span class="hljs-value">"match_parent"</span>
<span class="hljs-attribute">android:gravity</span>=<span class="hljs-value">"center_horizontal"</span>
<span class="hljs-attribute">android:orientation</span>=<span class="hljs-value">"vertical"</span> ></span>
<span class="hljs-tag"><<span class="hljs-title">RelativeLayout
</span> <span class="hljs-attribute">android:layout_width</span>=<span class="hljs-value">"match_parent"</span>
<span class="hljs-attribute">android:layout_height</span>=<span class="hljs-value">"wrap_content"</span>
<span class="hljs-attribute">android:background</span>=<span class="hljs-value">"#51CA65"</span>
<span class="hljs-attribute">android:padding</span>=<span class="hljs-value">"30dp"</span> ></span>
<span class="hljs-tag"><<span class="hljs-title">ImageView
</span> <span class="hljs-attribute">android:id</span>=<span class="hljs-value">"@+id/iv_personal_icon"</span>
<span class="hljs-attribute">android:layout_width</span>=<span class="hljs-value">"wrap_content"</span>
<span class="hljs-attribute">android:layout_height</span>=<span class="hljs-value">"wrap_content"</span>
<span class="hljs-attribute">android:layout_centerInParent</span>=<span class="hljs-value">"true"</span>
<span class="hljs-attribute">android:src</span>=<span class="hljs-value">"@drawable/default_personal_image"</span> /></span>
<span class="hljs-tag"></<span class="hljs-title">RelativeLayout</span>></span>
<span class="hljs-tag"><<span class="hljs-title">Button
</span> <span class="hljs-attribute">android:id</span>=<span class="hljs-value">"@+id/btn_change"</span>
<span class="hljs-attribute">android:layout_marginTop</span>=<span class="hljs-value">"6dp"</span>
<span class="hljs-attribute">android:layout_width</span>=<span class="hljs-value">"wrap_content"</span>
<span class="hljs-attribute">android:layout_height</span>=<span class="hljs-value">"wrap_content"</span>
<span class="hljs-attribute">android:text</span>=<span class="hljs-value">"修改头像"</span> ></span>
<span class="hljs-tag"></<span class="hljs-title">Button</span>></span>
<span class="hljs-tag"></<span class="hljs-title">LinearLayout</span>></span></code><ul class="pre-numbering"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li><li>17</li><li>18</li><li>19</li><li>20</li><li>21</li><li>22</li><li>23</li><li>24</li><li>25</li><li>26</li><li>27</li><li>28</li><li>29</li><li>30</li></ul><div class="save_code tracking-ad" style="display: none;" data-mod="popu_249"><a target=_blank target="_blank"><img src="http://static.blog.csdn.net/images/save_snippets.png" alt="" /></a></div>
MainActivity.java
<code class="language-java hljs has-numbering"><span class="hljs-keyword">package</span> com.example.uploadpicdemo;
<span class="hljs-keyword">import</span> java.io.File;
<span class="hljs-keyword">import</span> android.app.Activity;
<span class="hljs-keyword">import</span> android.app.AlertDialog;
<span class="hljs-keyword">import</span> android.content.DialogInterface;
<span class="hljs-keyword">import</span> android.content.Intent;
<span class="hljs-keyword">import</span> android.graphics.Bitmap;
<span class="hljs-keyword">import</span> android.net.Uri;
<span class="hljs-keyword">import</span> android.os.Bundle;
<span class="hljs-keyword">import</span> android.os.Environment;
<span class="hljs-keyword">import</span> android.provider.MediaStore;
<span class="hljs-keyword">import</span> android.util.Log;
<span class="hljs-keyword">import</span> android.view.View;
<span class="hljs-keyword">import</span> android.view.View.OnClickListener;
<span class="hljs-keyword">import</span> android.widget.Button;
<span class="hljs-keyword">import</span> android.widget.ImageView;
<span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">MainActivity</span> <span class="hljs-keyword">extends</span> <span class="hljs-title">Activity</span> {</span>
<span class="hljs-keyword">protected</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">final</span> <span class="hljs-keyword">int</span> CHOOSE_PICTURE = <span class="hljs-number">0</span>;
<span class="hljs-keyword">protected</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">final</span> <span class="hljs-keyword">int</span> TAKE_PICTURE = <span class="hljs-number">1</span>;
<span class="hljs-keyword">private</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">final</span> <span class="hljs-keyword">int</span> CROP_SMALL_PICTURE = <span class="hljs-number">2</span>;
<span class="hljs-keyword">protected</span> <span class="hljs-keyword">static</span> Uri tempUri;
<span class="hljs-keyword">private</span> ImageView iv_personal_icon;
<span class="hljs-annotation">@Override</span>
<span class="hljs-keyword">protected</span> <span class="hljs-keyword">void</span> <span class="hljs-title">onCreate</span>(Bundle savedInstanceState) {
<span class="hljs-keyword">super</span>.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button btn_change = (Button) findViewById(R.id.btn_change);
iv_personal_icon = (ImageView) findViewById(R.id.iv_personal_icon);
btn_change.setOnClickListener(<span class="hljs-keyword">new</span> OnClickListener() {
<span class="hljs-annotation">@Override</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">onClick</span>(View v) {
showChoosePicDialog();
}
});
}
<span class="hljs-javadoc">/**
* 显示修改头像的对话框
*/</span>
<span class="hljs-keyword">protected</span> <span class="hljs-keyword">void</span> <span class="hljs-title">showChoosePicDialog</span>() {
AlertDialog.Builder builder = <span class="hljs-keyword">new</span> AlertDialog.Builder(<span class="hljs-keyword">this</span>);
builder.setTitle(<span class="hljs-string">"设置头像"</span>);
String[] items = { <span class="hljs-string">"选择本地照片"</span>, <span class="hljs-string">"拍照"</span> };
builder.setNegativeButton(<span class="hljs-string">"取消"</span>, <span class="hljs-keyword">null</span>);
builder.setItems(items, <span class="hljs-keyword">new</span> DialogInterface.OnClickListener() {
<span class="hljs-annotation">@Override</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">onClick</span>(DialogInterface dialog, <span class="hljs-keyword">int</span> which) {
<span class="hljs-keyword">switch</span> (which) {
<span class="hljs-keyword">case</span> CHOOSE_PICTURE: <span class="hljs-comment">// 选择本地照片</span>
Intent openAlbumIntent = <span class="hljs-keyword">new</span> Intent(
Intent.ACTION_GET_CONTENT);
openAlbumIntent.setType(<span class="hljs-string">"image/*"</span>);
startActivityForResult(openAlbumIntent, CHOOSE_PICTURE);
<span class="hljs-keyword">break</span>;
<span class="hljs-keyword">case</span> TAKE_PICTURE: <span class="hljs-comment">// 拍照</span>
Intent openCameraIntent = <span class="hljs-keyword">new</span> Intent(
MediaStore.ACTION_IMAGE_CAPTURE);
tempUri = Uri.fromFile(<span class="hljs-keyword">new</span> File(Environment
.getExternalStorageDirectory(), <span class="hljs-string">"image.jpg"</span>));
<span class="hljs-comment">// 指定照片保存路径（SD卡），image.jpg为一个临时文件，每次拍照后这个图片都会被替换</span>
openCameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, tempUri);
startActivityForResult(openCameraIntent, TAKE_PICTURE);
<span class="hljs-keyword">break</span>;
}
}
});
builder.create().show();
}
<span class="hljs-annotation">@Override</span>
<span class="hljs-keyword">protected</span> <span class="hljs-keyword">void</span> <span class="hljs-title">onActivityResult</span>(<span class="hljs-keyword">int</span> requestCode, <span class="hljs-keyword">int</span> resultCode, Intent data) {
<span class="hljs-keyword">super</span>.onActivityResult(requestCode, resultCode, data);
<span class="hljs-keyword">if</span> (resultCode == RESULT_OK) { <span class="hljs-comment">// 如果返回码是可以用的</span>
<span class="hljs-keyword">switch</span> (requestCode) {
<span class="hljs-keyword">case</span> TAKE_PICTURE:
startPhotoZoom(tempUri); <span class="hljs-comment">// 开始对图片进行裁剪处理</span>
<span class="hljs-keyword">break</span>;
<span class="hljs-keyword">case</span> CHOOSE_PICTURE:
startPhotoZoom(data.getData()); <span class="hljs-comment">// 开始对图片进行裁剪处理</span>
<span class="hljs-keyword">break</span>;
<span class="hljs-keyword">case</span> CROP_SMALL_PICTURE:
<span class="hljs-keyword">if</span> (data != <span class="hljs-keyword">null</span>) {
setImageToView(data); <span class="hljs-comment">// 让刚才选择裁剪得到的图片显示在界面上</span>
}
<span class="hljs-keyword">break</span>;
}
}
}
<span class="hljs-javadoc">/**
* 裁剪图片方法实现
*
*<span class="hljs-javadoctag"> @param</span> uri
*/</span>
<span class="hljs-keyword">protected</span> <span class="hljs-keyword">void</span> <span class="hljs-title">startPhotoZoom</span>(Uri uri) {
<span class="hljs-keyword">if</span> (uri == <span class="hljs-keyword">null</span>) {
Log.i(<span class="hljs-string">"tag"</span>, <span class="hljs-string">"The uri is not exist."</span>);
}
tempUri = uri;
Intent intent = <span class="hljs-keyword">new</span> Intent(<span class="hljs-string">"com.android.camera.action.CROP"</span>);
intent.setDataAndType(uri, <span class="hljs-string">"image/*"</span>);
<span class="hljs-comment">// 设置裁剪</span>
intent.putExtra(<span class="hljs-string">"crop"</span>, <span class="hljs-string">"true"</span>);
<span class="hljs-comment">// aspectX aspectY 是宽高的比例</span>
intent.putExtra(<span class="hljs-string">"aspectX"</span>, <span class="hljs-number">1</span>);
intent.putExtra(<span class="hljs-string">"aspectY"</span>, <span class="hljs-number">1</span>);
<span class="hljs-comment">// outputX outputY 是裁剪图片宽高</span>
intent.putExtra(<span class="hljs-string">"outputX"</span>, <span class="hljs-number">150</span>);
intent.putExtra(<span class="hljs-string">"outputY"</span>, <span class="hljs-number">150</span>);
intent.putExtra(<span class="hljs-string">"return-data"</span>, <span class="hljs-keyword">true</span>);
startActivityForResult(intent, CROP_SMALL_PICTURE);
}
<span class="hljs-javadoc">/**
* 保存裁剪之后的图片数据
*
*<span class="hljs-javadoctag"> @param</span>
*
*<span class="hljs-javadoctag"> @param</span> picdata
*/</span>
<span class="hljs-keyword">protected</span> <span class="hljs-keyword">void</span> <span class="hljs-title">setImageToView</span>(Intent data) {
Bundle extras = data.getExtras();
<span class="hljs-keyword">if</span> (extras != <span class="hljs-keyword">null</span>) {
Bitmap photo = extras.getParcelable(<span class="hljs-string">"data"</span>);
photo = Utils.toRoundBitmap(photo, tempUri); <span class="hljs-comment">// 这个时候的图片已经被处理成圆形的了</span>
iv_personal_icon.setImageBitmap(photo);
uploadPic(photo);
}
}
<span class="hljs-keyword">private</span> <span class="hljs-keyword">void</span> <span class="hljs-title">uploadPic</span>(Bitmap bitmap) {
<span class="hljs-comment">// 上传至服务器</span>
<span class="hljs-comment">// ... 可以在这里把Bitmap转换成file，然后得到file的url，做文件上传操作</span>
<span class="hljs-comment">// 注意这里得到的图片已经是圆形图片了</span>
<span class="hljs-comment">// bitmap是没有做个圆形处理的，但已经被裁剪了</span>
String imagePath = Utils.savePhoto(bitmap, Environment
.getExternalStorageDirectory().getAbsolutePath(), String
.valueOf(System.currentTimeMillis()));
Log.e(<span class="hljs-string">"imagePath"</span>, imagePath+<span class="hljs-string">""</span>);
<span class="hljs-keyword">if</span>(imagePath != <span class="hljs-keyword">null</span>){
<span class="hljs-comment">// 拿着imagePath上传了</span>
<span class="hljs-comment">// ...</span>
}
}
}</code><ul class="pre-numbering"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li><li>17</li><li>18</li><li>19</li><li>20</li><li>21</li><li>22</li><li>23</li><li>24</li><li>25</li><li>26</li><li>27</li><li>28</li><li>29</li><li>30</li><li>31</li><li>32</li><li>33</li><li>34</li><li>35</li><li>36</li><li>37</li><li>38</li><li>39</li><li>40</li><li>41</li><li>42</li><li>43</li><li>44</li><li>45</li><li>46</li><li>47</li><li>48</li><li>49</li><li>50</li><li>51</li><li>52</li><li>53</li><li>54</li><li>55</li><li>56</li><li>57</li><li>58</li><li>59</li><li>60</li><li>61</li><li>62</li><li>63</li><li>64</li><li>65</li><li>66</li><li>67</li><li>68</li><li>69</li><li>70</li><li>71</li><li>72</li><li>73</li><li>74</li><li>75</li><li>76</li><li>77</li><li>78</li><li>79</li><li>80</li><li>81</li><li>82</li><li>83</li><li>84</li><li>85</li><li>86</li><li>87</li><li>88</li><li>89</li><li>90</li><li>91</li><li>92</li><li>93</li><li>94</li><li>95</li><li>96</li><li>97</li><li>98</li><li>99</li><li>100</li><li>101</li><li>102</li><li>103</li><li>104</li><li>105</li><li>106</li><li>107</li><li>108</li><li>109</li><li>110</li><li>111</li><li>112</li><li>113</li><li>114</li><li>115</li><li>116</li><li>117</li><li>118</li><li>119</li><li>120</li><li>121</li><li>122</li><li>123</li><li>124</li><li>125</li><li>126</li><li>127</li><li>128</li><li>129</li><li>130</li><li>131</li><li>132</li><li>133</li><li>134</li><li>135</li><li>136</li><li>137</li><li>138</li><li>139</li><li>140</li><li>141</li><li>142</li><li>143</li><li>144</li><li>145</li><li>146</li><li>147</li><li>148</li><li>149</li><li>150</li><li>151</li><li>152</li><li>153</li></ul><div class="save_code tracking-ad" style="display: none;" data-mod="popu_249"><a target=_blank target="_blank"><img src="http://static.blog.csdn.net/images/save_snippets.png" alt="" /></a></div>
ok,大功告成,最后别忘了在清单文件中添加读写sd可权限，不然得不到imagePath
<code class="language-xml hljs has-numbering"><span class="hljs-tag"><<span class="hljs-title">uses-permission</span> <span class="hljs-attribute">android:name</span>=<span class="hljs-value">"android.permission.WRITE_EXTERNAL_STORAGE"</span> /></span></code><ul class="pre-numbering"><li>1</li></ul><div class="save_code tracking-ad" data-mod="popu_249"><a target=_blank target="_blank"><img src="http://static.blog.csdn.net/images/save_snippets.png" alt="" /></a></div>
关于上面的隐示intent如果有什么不懂的可以参考
http://blog.csdn.net/ydxlt/article/details/47983661