Question

这是两个类 - SecondActivity和AnimationView。 SecondActivity扩展了Activity，AnimationView扩展了View.I想要传递＆＃34; text＆＃34;的值。从一个SecondActivity到AnimationView ..

我想使用字符串＆＃34; text＆＃34;在AnimationView类中。所以我需要将它的值从SecondActivity类传递给AnimationView类。我试图通过intent来实现它。但我认为它不可能通过intent，因为AnimationView没有扩展Activity

SecondActivity.java

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RectF;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;

public class SecondActivity extends Activity {
    AnimationView animationview;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Intent i = getIntent(); 
        String text = i.getStringExtra("TextBox"); 
        Intent in = new Intent(getApplicationContext(), AnimationView.class);
        in.putExtra("abc", text);

        setContentView(R.layout.activity_two);

        animationview=(AnimationView)findViewById(R.id.animationView);
    }

    @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;
    }

}

AnimationView.java

import android.content.Context;

import android.content.Intent;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.os.Handler;
import android.util.AttributeSet;
import android.app.Activity;
import android.view.View;
public class AnimationView extends View{
  private final int FRAME_RATE=15;
  private Paint paint;
  private Handler h;
  Ball myball;
  Ball greenball;
  Ball redball;


    public AnimationView(Context context,AttributeSet attrs) {
        super(context,attrs);
        // TODO Auto-generated constructor stub

        h=new Handler();
        paint=new Paint();
        paint.setColor(Color.BLUE);
        myball=new Ball(100,100,Color.BLUE,50);
        greenball=new Ball(200,200,Color.GREEN,50);
        redball=new Ball(50,400,Color.RED,50);
        myball.setDX(10);
        myball.setDY(10);
        greenball.setDX(10);
        greenball.setDY(10);
        redball.setDX(10);
        redball.setDY(10);

    }
    protected void onDraw(Canvas c)
    {
        myball.bounce(c);
        greenball.bounce(c);
        redball.bounce(c);
        myball.bounceoff(myball);
        greenball.bounceoff(greenball);
        redball.bounceoff(redball);


        c.drawCircle(myball.getX(), myball.getY(),myball.getRadius(), myball.getPaint());
        c.drawCircle(greenball.getX(), greenball.getY(),greenball.getRadius(), greenball.getPaint());
        c.drawCircle(redball.getX(), redball.getY(),redball.getRadius(), redball.getPaint());

        h.postDelayed(r, FRAME_RATE);

    }
    private Runnable r=new Runnable()
    { public void run()
    { invalidate();
    }
    };
    }

Answer 1

你有什么

Intent in = new Intent(getApplicationContext(), AnimationView.class);
in.putExtra("abc", text);

不起作用。它不是一个Activity类

你可以有一个setter方法

String value;
public void setString(String value)
{
   this.value = value;
}

然后

animationview.setString(text);

将值传递给不扩展Activity的类（Android）

1 个答案: