android自定义view图片绘制

1、PaintViewActivity

import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.view.View;

import com.HBuilder.integrate.PaintIt.PaintView;

import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;

public class PaintViewActivity extends Activity implements View.OnClickListener,View.OnLongClickListener {


    private  Bitmap bitmap;
    private PaintView paintView;



    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_paint_view);
        paintView = findViewById(R.id.paintView);
        final String iPath = this.getIntent().getStringExtra("url");
        //为了下载图片资源，开辟一个新的子线程
        Thread t=new Thread(){
            public void run() {
                //下载图片的路径
                try {
                    //对资源链接
                    URL url=new URL(iPath);
                    //打开输入流
                    InputStream inputStream=url.openStream();
                    //对网上资源进行下载转换位图图片
                    bitmap=BitmapFactory.decodeStream(inputStream);
                    paintView.initBitmap(bitmap);
                } catch (MalformedURLException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            };
        };
        t.start();

        findViewById(R.id.paint).setOnClickListener(this);
        findViewById(R.id.text).setOnClickListener(this);
        findViewById(R.id.back).setOnClickListener(this);
        findViewById(R.id.clear).setOnClickListener(this);
        findViewById(R.id.save).setOnClickListener(this);
        findViewById(R.id.move).setOnClickListener(this);
        findViewById(R.id.zoom).setOnClickListener(this);
        findViewById(R.id.reset).setOnClickListener(this);
    }



    @Override
    public void onClick(View v) {
        switch (v.getId()) {

            case R.id.paint:
                // use paint
                paintView.paint();
                break;
            case R.id.text:
                // use paint
                paintView.text();
                break;
            case R.id.back:
                // use paint
                paintView.back();
                break;
            case R.id.clear:
                // use paint
                paintView.Clear();
                break;
            case R.id.save:
                // use paint
                paintView.save();
                break;
            case R.id.move:
                // use paint
                paintView.move();
                break;
            case R.id.zoom:
                // use paint
                paintView.zoom();
                break;
            case R.id.reset:
                // use paint
                paintView.reset();
                break;

        }
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

    }

    @Override
    public boolean onLongClick(View v) {
       return true;
    }


    @Override
    public void onBackPressed() {
        paintView.showCustomToast("返回");
        finish();
        //TODO something
        super.onBackPressed();

    }


}

2、PaintView

import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.Rect;
import android.os.Environment;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import com.HBuilder.integrate.R;
import com.HBuilder.integrate.TextNode;

import java.io.File;
import java.io.FileOutputStream;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.List;


/**
 * Package com.hc.studyview
 * Created by HuaChao on 2016/6/3.
 */
public class PaintView extends View {

	private Context context;
	private boolean isPaint = false;//空心正方形
	private boolean isText = false;//文字
	private boolean isMove = true;//移动
	private boolean isZoom = false;//缩放
	private Paint mPaint;//画笔
	private Bitmap originalBitmap;//原始图片
	private Bitmap bitmap;//处理后图片
	private List