view 生成 bitmap

超、凢脫俗 2022-07-16 21:09 114阅读 0赞

在开发短信祝福的时候看到别人写了一个贺卡（Imageview textview（edittext）结合），其实原理很简单就是把整个 view 生成了一个bitmap。

//重要部分
                 LinearLayout mCenter = (LinearLayout) findViewById(R.id.bitmap);
                 mCenter.buildDrawingCache();
                 mCenter.setDrawingCacheEnabled(true);
                 Bitmap b1 = mCenter.getDrawingCache();

中心代码：

全部代码如下：

package com.example.sendmsg;
    
    import android.annotation.SuppressLint;
    import android.annotation.TargetApi;
    import android.app.ActionBar;
    import android.app.Activity;
    import android.app.AlertDialog;
    import android.app.AlertDialog.Builder;
    import android.app.Dialog;
    import android.content.DialogInterface;
    import android.content.Intent;
    import android.graphics.Bitmap;
    import android.graphics.Typeface;
    import android.os.Build;
    import android.os.Bundle;
    import android.view.View;
    import android.view.View.OnClickListener;
    import android.widget.AdapterView;
    import android.widget.AdapterView.OnItemClickListener;
    import android.widget.Button;
    import android.widget.EditText;
    import android.widget.ImageView;
    import android.widget.LinearLayout;
    import android.widget.TextView;
    import android.widget.Toast;
    
    public class CardViewActivity extends Activity{
        
    
        private ImageView topiamge,bottomimage,answer,main_image,changeimage,changetext;
        private EditText content;
        private LinearLayout sendmsg;
        private LinearLayout mCenter;
        private TextView title;
        private Builder builder;
        private Dialog dialog;
    
    
        @TargetApi(Build.VERSION_CODES.HONEYCOMB)
        @SuppressLint("NewApi")
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            // TODO Auto-generated method stub
            super.onCreate(savedInstanceState);
            setContentView(R.layout.cardvieww);
    
            init();
    
            ActionBar actionBar = getActionBar();  
            actionBar.hide();
    
        }
    
        public void init(){
            Intent intent = getIntent();
            String text = intent.getStringExtra("content");
    
            topiamge = (ImageView) findViewById(R.id.topimage);
            bottomimage = (ImageView) findViewById(R.id.bottomimage);
            content = (EditText) findViewById(R.id.content);
            sendmsg = (LinearLayout) findViewById(R.id.sendmsg);
            mCenter = (LinearLayout) findViewById(R.id.bitmap);
    
            content.setText(text);
            sendmsg.setOnClickListener(new ButtonClick());
    
            main_image = (ImageView) findViewById(R.id.main_image);
            title = (TextView) findViewById(R.id.title);
            changeimage = (ImageView) findViewById(R.id.changeimage);
            changetext = (ImageView) findViewById(R.id.changetext);
    
            main_image.setOnClickListener(new BackOnclcik());
            changeimage.setOnClickListener(new ChangeClick());
            changetext.setOnClickListener(new TextStyleClick());
            //yanzheng
            //answer = (ImageView) findViewById(R.id.answer);
        }
    
    
    
    
        class ButtonClick implements OnClickListener{
    
            @Override
            public void onClick(View arg0) {
                // TODO Auto-generated method stub
                 mCenter.buildDrawingCache();
                 mCenter.setDrawingCacheEnabled(true);
                 Bitmap b1 = mCenter.getDrawingCache();  
    
    
                 //answer.setImageBitmap(b1);
                //Toast.makeText(CardViewActivity.this, "OK!", Toast.LENGTH_LONG).show();
            }
    
        }
    
        class BackOnclcik implements OnClickListener{
    
            @Override
            public void onClick(View arg0) {
                // TODO Auto-generated method stub
                finish();
            }
    
        }
    
        class ChangeClick implements OnClickListener{
    
            @Override
            public void onClick(View arg0) {
                // TODO Auto-generated method stub
                topiamge.setBackgroundResource(R.drawable.top1);
                bottomimage.setBackgroundResource(R.drawable.bottom2);
    
            }
    
        }
    
    //  class ChangeTextClick implements OnClickListener{
        
    //
    //      @Override
    //      public void onClick(View arg0) {
        
    //          // TODO Auto-generated method stub
    //          Typeface face = Typeface.createFromAsset (getAssets(), "fonts/fzybxs.TTF" ); 
    //          content.setTypeface(face);
    //      }
    //      
    //  }
    
    
    //一个简单的对话框，改变字体的（忽略不看）
        class TextStyleClick implements OnClickListener{
    
            @Override
            public void onClick(View arg0) {
                // TODO Auto-generated method stub
                //定义一个AlertDialog.Builder对象  
                builder = new AlertDialog.Builder(CardViewActivity.this);
                LinearLayout loginForm = (LinearLayout)getLayoutInflater().inflate(R.layout.dialogtext,null);
                LinearLayout layout1 = (LinearLayout) loginForm.findViewById(R.id.layout1);
                LinearLayout layout2 = (LinearLayout) loginForm.findViewById(R.id.layout2);
                LinearLayout layout3 = (LinearLayout) loginForm.findViewById(R.id.layout3);
                LinearLayout layout4 = (LinearLayout) loginForm.findViewById(R.id.layout4);
    
    
                // 设置对话框显示的View对象  
                builder.setView(loginForm);  
    
                //创建、并显示对话框  
                builder.create(); 
                dialog = builder.show();
    
                layout1.setOnClickListener(new OnClickListener() {
    
                    @Override
                    public void onClick(View arg0) {
                        // TODO Auto-generated method stub
                        Typeface face = Typeface.create("正常", Typeface.NORMAL);
                        content.setTypeface(face);
                        dialog.dismiss();
                    }
                });
    
    
                layout2.setOnClickListener(new OnClickListener() {
    
                    @Override
                    public void onClick(View arg0) {
                        // TODO Auto-generated method stub
                        Typeface face = Typeface.createFromAsset (getAssets(), "fonts/ls.ttf" ); 
                        content.setTypeface(face);
                        dialog.dismiss();
                    }
                });
    
                layout3.setOnClickListener(new OnClickListener() {
    
                    @Override
                    public void onClick(View arg0) {
                        // TODO Auto-generated method stub
                        Typeface face = Typeface.createFromAsset (getAssets(), "fonts/fzybxs.TTF" ); //字体变换
                        content.setTypeface(face);
                        dialog.dismiss();//点击退出dialog
                    }
                });
    
                layout4.setOnClickListener(new OnClickListener() {
    
                    @Override
                    public void onClick(View arg0) {
                        // TODO Auto-generated method stub
                        Typeface face = Typeface.createFromAsset (getAssets(), "fonts/yy.ttf" ); 
                        content.setTypeface(face);
                        dialog.dismiss();
                    }
                });
    
                dialog.show();
            }
    
        }
    
    
    }