<?xml version="1.0" encoding="utf-8"?>

 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

     android:layout_width="match_parent"

     android:layout_height="match_parent"

     android:orientation="vertical">

     <LinearLayout

         android:layout_width="match_parent"

         android:layout_height="300dp"

         android:layout_marginTop="10dp"

         android:orientation="horizontal">

         <TextView

             android:id="@+id/tv_capture"

             android:layout_width="0dp"

             android:layout_height="match_parent"

             android:layout_weight="1"

             android:background="#ffffff"

             android:textColor="#000000"

             android:scrollbars="vertical"

             android:textSize="17sp" />

         <ImageView

             android:id="@+id/iv_capture"

             android:layout_width="0dp"

             android:layout_height="match_parent"

             android:layout_weight="1" />

     </LinearLayout>

     <LinearLayout

         android:layout_width="match_parent"

         android:layout_height="wrap_content"

         android:layout_marginTop="10dp"

         android:orientation="horizontal">

         <Button

             android:id="@+id/btn_chat"

             android:layout_width="0dp"

             android:layout_height="wrap_content"

             android:layout_weight="1"

             android:text="聊天"

             android:textColor="#000000"

             android:textSize="17sp" />

         <Button

             android:id="@+id/btn_capture"

             android:layout_width="0dp"

             android:layout_height="wrap_content"

             android:layout_weight="1"

             android:text="截图"

             android:textColor="#000000"

             android:textSize="17sp" />

     </LinearLayout>

 </LinearLayout>

 package com.example.alimjan.hello_world;

 /**

  * Created by alimjan on 7/1/2017.

  */

 import android.content.Context;

 import android.content.Intent;

 import android.graphics.Bitmap;

         import android.os.Bundle;

         import android.os.Handler;

         import android.support.v7.app.AppCompatActivity;

 import android.text.method.ScrollingMovementMethod;

 import android.view.Gravity;

 import android.view.View;

         import android.widget.Button;

         import android.widget.ImageView;

         import android.widget.TextView;

 public class class__2_3_3_2 extends AppCompatActivity implements View.OnClickListener, View.OnLongClickListener {

     private TextView tv_capture;

     private ImageView iv_capture;

     @Override

     protected void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.code_2_3_3_2);

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

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

         tv_capture.setDrawingCacheEnabled(true);

         tv_capture.setGravity(Gravity.LEFT|Gravity.BOTTOM);

         tv_capture.setLines(17);

         tv_capture.setMaxLines(17);

         tv_capture.setMovementMethod(new ScrollingMovementMethod());

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

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

         btn_chat.setOnClickListener(this);

         btn_chat.setOnLongClickListener(this);

         btn_capture.setOnClickListener(this);

     }

     private String[] mChatStr = { "你吃饭了吗？", "今天天气真好呀。",

             "我中奖啦！", "我们去看电影吧。", "晚上干什么好呢？" };

     @Override

     public boolean onLongClick(View v) {

         if (v.getId() == R.id.btn_chat) {

             tv_capture.setText("");

         }

         return true;

     }

     @Override

     public void onClick(View v) {

         if (v.getId() == R.id.btn_chat) {

             int random = (int)(Math.random()*10) % 5;

             String newStr = String.format("%s\n%s %s",

                     tv_capture.getText().toString(), DateUtil.getCurDateStr(), mChatStr[random]);

             tv_capture.setText(newStr);

         } else if (v.getId() == R.id.btn_capture) {

             Bitmap bitmap = tv_capture.getDrawingCache();

             iv_capture.setImageBitmap(bitmap);

             // 注意这里在截图完毕后不能马上关闭绘图缓存，因为画面渲染需要时间，

             // 如果立即关闭缓存，渲染画面就会找不到位图对象，会报错

             // “java.lang.IllegalArgumentException: Cannot draw recycled bitmaps”。

             mHandler.postDelayed(mResetCache, 200);

         }

     }

     private Handler mHandler = new Handler();

     private Runnable mResetCache = new Runnable() {

         @Override

         public void run() {

             tv_capture.setDrawingCacheEnabled(false);

             tv_capture.setDrawingCacheEnabled(true);

         }

     };

     public static void startHome(Context mContext) {

         Intent intent = new Intent(mContext, class__2_3_3_2.class);

         mContext.startActivity(intent);

     }

 }