Android studio 使用Zxing二維碼掃描，過程及問題匯總

本文講了Android studio 匯入zxing的兩種方法，僅供參考。 1.直接complie匯入

1.1 在需要使用zxing進行二維碼掃描的項目的build.gradle直接complie

<code class="hljs nginx has-numbering" style="display: block; padding: 0px; background: transparent; color: inherit; box-sizing: border-box; font-family: "Source Code Pro", monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal;">    <span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">compile</span> <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'com.journeyapps:zxing-android-embedded:2.3.0<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">@aar</span>'</span>    compile <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'com.journeyapps:zxing-android-legacy:2.3.0<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">@aar</span>'</span>    compile <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'com.journeyapps:zxing-android-integration:2.3.0<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">@aar</span>'</span>    compile <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'com.google.zxing:core:3.2.0'</span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right: 1px solid rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right: 1px solid rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li></ul>

1.2 調用：

<code class="hljs cs has-numbering" style="display: block; padding: 0px; background: transparent; color: inherit; box-sizing: border-box; font-family: "Source Code Pro", monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal;">    IntentIntegrator integrator=<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span>         IntentIntegrator(MainActivity.<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">this</span>);    integrator.initiateScan();</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right: 1px solid rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right: 1px solid rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li></ul>

1.3 回調結果：

<code class="hljs java has-numbering" style="display: block; padding: 0px; background: transparent; color: inherit; box-sizing: border-box; font-family: "Source Code Pro", monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">protected</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">onActivityResult</span>(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> requestCode, <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> resultCode, Intent data) {        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">super</span>.onActivityResult(requestCode, resultCode, data);        IntentResult scanResult =IntentIntegrator.parseActivityResult(requestCode,resultCode,data);        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (scanResult !=<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">null</span>){            String result=scanResult.getContents();            Toast.makeText(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">this</span>,result,Toast.LENGTH_LONG).show();        }        }</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right: 1px solid rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right: 1px solid rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li></ul>

到這裡 就可以看到掃描二維碼的介面和得到掃描結果了，但是這種直接compile的方法，不能改變掃描介面是橫屏的情況。 2.將Module改成library,並修改成豎屏

2.1 github上下載好zxing源碼。https://github.com/zxing/zxing 
將源碼裡的android項目匯入 
 
在build.gradle修改 

在manifest裡修改(CaptureActivity就是要調用的類） 

2.2 問題1 常量運算式錯誤 
在修改完build檔案後，報了一個常量運算式錯誤的問題，發現是在各個switch語句那裡，Alt+Enter 將switch case 語句改為 if else. 
原因：避免多個庫之間出現資源衝突 （具體可以去查閱） 

問題2 Manifest問題 
因為我們是將一個Module直接改成library,所以要把相同的屬性刪掉，類似 android:icon,andoid:label,IntentFileter等都要刪除。 
2.3 在自己的項目中引用

<code class="hljs scss has-numbering" style="display: block; padding: 0px; background: transparent; color: inherit; box-sizing: border-box; font-family: "Source Code Pro", monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal;">compile <span class="hljs-function" style="box-sizing: border-box;">project(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">':android'</span>)</span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right: 1px solid rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right: 1px solid rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li></ul>

掃描介面的各個view都可以在CaptureActivity中修改。 

調用結果 

心得：這幾天為了弄這個，真是翻遍牆裡牆外，每天都處於煎熬中，有時候真想有個大神指導就好了，分分鐘就能解決這些問題。 
好吧，還是得靠自己，加油。