昨天写了个小Demo，实现了随机生成验证码，和锁定EditText两个小功能，先看一下效果图：

锁定EditText在我们不须要用户编辑EditText内容的时候能够用到，实现还是非常easy的，一行代码：

etLock.setEnabled(false);

随机生成验证码，主要是用了Random函数，以及将View转为Bitmap的逻辑，也没有难点，以下贴一下代码，供须要的朋友參考：

Main.java

package com.zms.textlock;

import android.graphics.Bitmap;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.Matrix;

import android.support.v7.app.ActionBarActivity;

import android.os.Bundle;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import android.widget.ImageView;

import android.widget.TextView;

import java.util.Random;

public class Main extends ActionBarActivity {

    private Button btnLock;

    private EditText etLock;

    private String numStrTmp = "";

    private String numStr = "";

    private int[] numArray = new int[4];

    private int[] colorArray = new int[6];

    private TextView tvHideA;

    private TextView tvHideB;

    private TextView tvHideC;

    private TextView tvHideD;

    private ImageView ivNumA;

    private ImageView ivNumB;

    private ImageView ivNumC;

    private ImageView ivNumD;

    private Button btnCheck;

    private TextView tvCheck;

    private EditText etCheck;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

        btnLock = (Button) findViewById(R.id.btnLock);

        etLock = (EditText) findViewById(R.id.etLock);

        btnLock.setOnClickListener(new onClickListenerImp());

        tvHideA = (TextView) findViewById(R.id.tvHideA);

        tvHideB = (TextView) findViewById(R.id.tvHideB);

        tvHideC = (TextView) findViewById(R.id.tvHideC);

        tvHideD = (TextView) findViewById(R.id.tvHideD);

        ivNumA = (ImageView) findViewById(R.id.ivNumA);

        ivNumB = (ImageView) findViewById(R.id.ivNumB);

        ivNumC = (ImageView) findViewById(R.id.ivNumC);

        ivNumD = (ImageView) findViewById(R.id.ivNumD);

        tvCheck = (TextView) findViewById(R.id.tvCheck);

        etCheck = (EditText) findViewById(R.id.etCheck);

        btnCheck = (Button) findViewById(R.id.btnCheck);

        btnCheck.setOnClickListener(new onClickListenerImp());

        setNum();

    }

    private class onClickListenerImp implements View.OnClickListener {

        @Override

        public void onClick(View view) {

            if (view == btnLock) {

                if (etLock.isEnabled()) {

                    etLock.setEnabled(false);

                    btnLock.setText("解锁");

                } else {

                    etLock.setEnabled(true);

                    btnLock.setText("锁定");

                }

            } else if (view == btnCheck) {

                if (etCheck.getText().toString() != null && etCheck.getText().toString().trim().length() > 0) {

                    tvCheck.setVisibility(View.VISIBLE);

                    if (numStr.equals(etCheck.getText().toString())) {

                        tvCheck.setText("输入正确");

                        tvCheck.setTextColor(Color.GREEN);

                    } else {

                        tvCheck.setText("输入错误");

                        tvCheck.setTextColor(Color.RED);

                    }

                } else {

                    setNum();

                    tvCheck.setVisibility(View.GONE);

                    //Toast.makeText(Main.this, "Please Input Verify Code", Toast.LENGTH_SHORT).show();

                }

            }

        }

    }

    public void initNum() {

        numStr = "";

        numStrTmp = "";

        for (int i = 0; i < numArray.length; i++) {

            int numIntTmp = new Random().nextInt(10);

            numStrTmp = String.valueOf(numIntTmp);

            numStr = numStr + numStrTmp;

            numArray[i] = numIntTmp;

        }

    }

    public void setNum() {

        initNum();

        tvHideA.setText("" + numArray[0]);

        tvHideA.setTextColor(randomColor());

        tvHideB.setText("" + numArray[1]);

        tvHideB.setTextColor(randomColor());

        tvHideC.setText("" + numArray[2]);

        tvHideC.setTextColor(randomColor());

        tvHideD.setText("" + numArray[3]);

        tvHideD.setTextColor(randomColor());

        // Num 1

        Matrix matrixA = new Matrix();

        matrixA.reset();

        matrixA.setRotate(randomAngle());

        Bitmap bmNumA = Bitmap.createBitmap(getBitmapFromView(tvHideA, 20, 50), 0, 0, 20, 50, matrixA, true);

        ivNumA.setImageBitmap(bmNumA);

        // Num 2

        Matrix matrixB = new Matrix();

        matrixB.reset();

        matrixB.setRotate(randomAngle());

        Bitmap bmNumB = Bitmap.createBitmap(getBitmapFromView(tvHideB, 20, 50), 0, 0, 20, 50, matrixB, true);

        ivNumB.setImageBitmap(bmNumB);

        // Num 3

        Matrix matrixC = new Matrix();

        matrixC.reset();

        matrixC.setRotate(randomAngle());

        Bitmap bmNumC = Bitmap.createBitmap(getBitmapFromView(tvHideC, 20, 50), 0, 0, 20, 50, matrixC, true);

        ivNumC.setImageBitmap(bmNumC);

        // Num 4

        Matrix matrixD = new Matrix();

        matrixD.reset();

        matrixD.setRotate(randomAngle());

        Bitmap bmNumD = Bitmap.createBitmap(getBitmapFromView(tvHideD, 20, 50), 0, 0, 20, 50, matrixD, true);

        ivNumD.setImageBitmap(bmNumD);

    }

    public int randomAngle() {

        return 20 * (new Random().nextInt(5) - new Random().nextInt(3));

    }

    public int randomColor() {

        colorArray[0] = 0xFF000000; // BLACK

        colorArray[1] = 0xFFFF00FF; // MAGENTA

        colorArray[2] = 0xFFFF0000; // RED

        colorArray[3] = 0xFF00FF00; // GREEN

        colorArray[4] = 0xFF0000FF; // BLUE

        colorArray[5] = 0xFF00FFFF; // CYAN

        //colorArray[6] = 0xFFFFFF00; // YELLOW:看不清楚

        int randomColorId = new Random().nextInt(6);

        return colorArray[randomColorId];

    }

    public static Bitmap getBitmapFromView(View view, int width, int height) {

        int widthSpec = View.MeasureSpec.makeMeasureSpec(width, View.MeasureSpec.EXACTLY);

        int heightSpec = View.MeasureSpec.makeMeasureSpec(height, View.MeasureSpec.EXACTLY);

        view.measure(widthSpec, heightSpec);

        view.layout(0, 0, width, height);

        Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);

        Canvas canvas = new Canvas(bitmap);

        view.draw(canvas);

        return bitmap;

    }

    @Override

    public boolean onCreateOptionsMenu(Menu menu) {

        // Inflate the menu; this adds items to the action bar if it is present.

        getMenuInflater().inflate(R.menu.main, menu);

        return true;

    }

    @Override

    public boolean onOptionsItemSelected(MenuItem item) {

        // Handle action bar item clicks here. The action bar will

        // automatically handle clicks on the Home/Up button, so long

        // as you specify a parent activity in AndroidManifest.xml.

        int id = item.getItemId();

        //noinspection SimplifiableIfStatement

        if (id == R.id.action_settings) {

            return true;

        }

        return super.onOptionsItemSelected(item);

    }

}

布局文件： main.xml

<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:paddingLeft="@dimen/activity_horizontal_margin"

    android:paddingRight="@dimen/activity_horizontal_margin"

    android:paddingTop="@dimen/activity_vertical_margin"

    android:paddingBottom="@dimen/activity_vertical_margin"

    android:orientation="vertical"

    tools:context=".Main">

    <TextView

        android:layout_width="wrap_content"

        android:text="锁定EditText内容："

        android:layout_height="wrap_content" />

    <LinearLayout

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:orientation="horizontal">

        <EditText

            android:id="@+id/etLock"

            android:layout_width="200dp"

            android:layout_height="wrap_content" />

        <Button

            android:id="@+id/btnLock"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="锁定" />

    </LinearLayout>

    <TextView

        android:layout_marginTop="50dp"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="随机生成4位验证码：" />

    <LinearLayout

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:orientation="horizontal">

        <LinearLayout

            android:id="@+id/layVerify"

            android:orientation="horizontal"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content">

            <TextView

                android:id="@+id/tvHideA"

                android:layout_width="70dp"

                android:layout_height="70dp"

                android:textSize="30dp"

                android:gravity="center"

                android:visibility="gone" />

            <TextView

                android:id="@+id/tvHideB"

                android:layout_width="70dp"

                android:layout_height="70dp"

                android:textSize="30dp"

                android:gravity="center"

                android:visibility="gone" />

            <TextView

                android:id="@+id/tvHideC"

                android:layout_width="70dp"

                android:layout_height="70dp"

                android:textSize="30dp"

                android:gravity="center"

                android:visibility="gone" />

            <TextView

                android:id="@+id/tvHideD"

                android:layout_width="70dp"

                android:layout_height="70dp"

                android:textSize="30dp"

                android:gravity="center"

                android:visibility="gone" />

        </LinearLayout>

        <LinearLayout

            android:layout_width="wrap_content"

            android:orientation="horizontal"

            android:layout_height="wrap_content">

            <ImageView

                android:id="@+id/ivNumA"

                android:layout_width="50dp"

                android:layout_height="70dp" />

            <ImageView

                android:id="@+id/ivNumB"

                android:layout_width="50dp"

                android:layout_height="70dp" />

            <ImageView

                android:id="@+id/ivNumC"

                android:layout_width="50dp"

                android:layout_height="70dp" />

            <ImageView

                android:id="@+id/ivNumD"

                android:layout_width="50dp"

                android:layout_height="70dp" />

        </LinearLayout>

    </LinearLayout>

    <LinearLayout

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:orientation="horizontal">

        <EditText

            android:id="@+id/etCheck"

            android:hint="验证码"

            android:layout_width="80dp"

            android:layout_height="wrap_content" />

        <TextView

            android:id="@+id/tvCheck"

            android:text="结果"

            android:visibility="gone"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content" />

    </LinearLayout>

    <Button

        android:id="@+id/btnCheck"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="确定" />

</LinearLayout>

有疑问欢迎交流~

还是上传一下代码吧，是用Android Studio写的。链接：代码下载

转载请注明出处：周木水的CSDN博客 http://blog.csdn.net/zhoumushui

我的GitHub：周木水的GitHub https://github.com/zhoumushui

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