Android如何实现扫描和生成二维码

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" tools:context=".MainActivity" >  <Button  android:id="@+id/btScan"  android:layout_width="fill_parent"  android:layout_height="wrap_content"  android:text="开始扫描二维码" />  <TextView  android:id="@+id/tvShow"  android:layout_width="wrap_content"  android:layout_height="wrap_content"  android:layout_marginTop="20dp"  android:text="二维码结果：" />  <EditText  android:id="@+id/etInput"  android:layout_width="fill_parent"  android:layout_height="wrap_content"  android:layout_marginTop="50dp"  android:hint="请输入要编码的内容">   </EditText>  <Button  android:id="@+id/btGet"  android:layout_width="fill_parent"  android:layout_height="wrap_content"  android:text="生成二维码" />  <ImageView   android:id="@+id/ivCode"  android:layout_width="wrap_content"  android:layout_height="wrap_content"  android:layout_gravity="center_horizontal"/> </LinearLayout>

package com.example.testqrcode; import com.google.zxing.WriterException;import com.zxing.activity.CaptureActivity;import com.zxing.encoding.EncodingHandler; import android.os.Bundle;import android.app.Activity;import android.content.Intent;import android.graphics.Bitmap;import android.view.Menu;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.ImageView;import android.widget.TextView;import android.widget.Toast; public class MainActivity extends Activity { private Button btScan, btGet; private TextView tvShow; private ImageView ivCode; private EditText etInput;  @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main);  btScan = (Button) findViewById(R.id.btScan); tvShow = (TextView) findViewById(R.id.tvShow); btGet = (Button) findViewById(R.id.btGet); ivCode = (ImageView) findViewById(R.id.ivCode); etInput = (EditText) findViewById(R.id.etInput);  // 扫描二维码 btScan.setOnClickListener(new OnClickListener() {  @Override public void onClick(View arg0) { Toast.makeText(MainActivity.this, "你可以扫描条形码或者二维码",  Toast.LENGTH_SHORT).show(); Intent intent = new Intent(MainActivity.this,  CaptureActivity.class); // startActivity(intent); //不能回传数据的跳转方式 startActivityForResult(intent, 0); // 能获取回传数据的跳转方式 } });  // 生成二维码 btGet.setOnClickListener(new OnClickListener() {  @Override public void onClick(View arg0) { String in = etInput.getText().toString(); if (in.equals("")) {  Toast.makeText(MainActivity.this, "请输入文本",  Toast.LENGTH_SHORT).show(); } else {  try {   Bitmap qrcode = EncodingHandler.createQRCode(in, 400);  ivCode.setImageBitmap(qrcode);  } catch (WriterException e) {  // TODO Auto-generated catch block  e.printStackTrace();  }// 第一个参数是想要生成的文本，第二个参数是生成二维码横向和纵向的宽度 } } }); }  // 接收扫描的activity传回来的值 @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); if (resultCode == RESULT_OK) { String result = data.getExtras().getString("result"); tvShow.setText(result); } } }

<uses-permission android:name="android.permission.CAMERA"/> <uses-permission android:name="android.permission.VIBRATE"/>

<activity  android:name="com.zxing.activity.CaptureActivity"  android:configChanges="orientation|keyboardHidden"  android:screenOrientation="portrait"  android:theme="@android:style/Theme.NoTitleBar.Fullscreen"  android:windowSoftInputMode="stateAlwaysHidden" ></activity>