学习安卓开发第六天【拖动条实例】【图片切换器】【滑动查看相册功能】【网格视图】

package com.example.seekbar;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.widget.ImageView;
import android.widget.SeekBar;

public class MainActivity extends AppCompatActivity {
private SeekBar seekBar;
private ImageView image;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        image=findViewById(R.id.image);
        seekBar=findViewById(R.id.seekbar);
        seekBar.setonSeekBarChangeListener(new SeekBar.onSeekBarChangeListener() {
            @Override
            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
                image.setImageAlpha(progress);

            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {

            }

            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {

            }
        });


    }
}

拖动条

星际评分

package com.example.demoq;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.widget.RatingBar;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        RatingBar rb=findViewById(R.id.ratingbar);

        String rating=String.valueOf(rb.getRating());

        Toast.makeText(MainActivity.this, "Rating:"+rating, Toast.LENGTH_SHORT).show();

   String stepSize=String.valueOf(rb.getStepSize());
        Toast.makeText(MainActivity.this, "StepSize"+stepSize, Toast.LENGTH_SHORT).show();

        String progress=String.valueOf(rb.getProgress());

        Toast.makeText(MainActivity.this, "Progress"+progress, Toast.LENGTH_SHORT).show();

    }

}

图片切换语法

：

package com.example.demoq;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.ImageSwitcher;
import android.widget.ImageView;
import android.widget.RatingBar;
import android.widget.Toast;
import android.widget.ViewSwitcher;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ImageSwitcher is=findViewById(R.id.imageswitcher);
        is.setOutAnimation(AnimationUtils.loadAnimation(MainActivity.this,android.R.anim.fade_out));

        is.setInAnimation(AnimationUtils.loadAnimation(MainActivity.this,android.R.anim.fade_in));

        is.setFactory(new ViewSwitcher.ViewFactory() {
            @Override
            public View makeView() {
                ImageView imageView=new ImageView(MainActivity.this);
                imageView.setImageResource(R.drawable.a);

                return imageView;
            }
        });
        is.setonClickListener(new View.onClickListener() {
            @Override
            public void onClick(View v) {
                ((ImageSwitcher)v).setImageResource(R.drawable.b);
            }
        });


    }

}

就是点击图片可以切换下一张

package com.example.demoq;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.view.WindowManager;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.ImageSwitcher;
import android.widget.ImageView;
import android.widget.RatingBar;
import android.widget.Toast;
import android.widget.ViewSwitcher;

public class MainActivity extends AppCompatActivity {
private int [] arrayPicture=new int []{
        R.drawable.a,R.drawable.b,R.drawable.c,R.drawable.d,R.drawable.e,R.drawable.f,R.drawable.g
        ,R.drawable.h
        ,R.drawable.i
        ,R.drawable.j


};
private ImageSwitcher imageSwitcher;
private int index;
private float touchDownX;
private float touchUpX;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager
        .LayoutParams.FLAG_FULLSCREEN);
        imageSwitcher=findViewById(R.id.imageswitcher);
        imageSwitcher.setFactory(new ViewSwitcher.ViewFactory() {
            @Override
            public View makeView() {
                ImageView imageView=new ImageView(MainActivity.this);
                imageView.setImageResource(arrayPicture[index]);

                return imageView;
            }
        });

        imageSwitcher.setonTouchListener(new View.onTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {

                if(event.getAction()==MotionEvent.ACTION_DOWN){//判断是否按下
                    touchDownX=event.getX();
                return true;
                }else if(event.getAction()==MotionEvent.ACTION_UP){
                    touchUpX=event.getY();
                    if(touchUpX-touchDownX>100){
                        index=index==0?arrayPicture.length-1:index-1;
                    imageSwitcher.setInAnimation(AnimationUtils.loadAnimation(MainActivity.this,R.anim.slide_in_left));
                        imageSwitcher.setOutAnimation(AnimationUtils.loadAnimation(MainActivity.this,R.anim.slide_out_right));

                        imageSwitcher.setImageResource(arrayPicture[index]);

                    }else if(touchDownX-touchUpX>100){

                        index=index==arrayPicture.length-1?0:index+1;
                        imageSwitcher.setInAnimation(AnimationUtils.loadAnimation(MainActivity.this,R.anim.slide_in_right));
                        imageSwitcher.setOutAnimation(AnimationUtils.loadAnimation(MainActivity.this,R.anim.slide_out_left));

                        imageSwitcher.setImageResource(arrayPicture[index]);


                    }
                    return true;
                }

                return false;
            }
        });

    }

}

这个我不会写slide_out/in_left/right的xml代码，我也没有找到这个代码，所以这个实例运行不出来

package com.example.aa;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.widget.GridView;
import android.widget.SimpleAdapter;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class MainActivity extends AppCompatActivity {
private int []picture=new int[]{
      R.mipmap.a ,R.mipmap.b,R.mipmap.c,R.mipmap.d
        ,R.mipmap.e,R.mipmap.f,R.mipmap.g,R.mipmap.h
        ,R.mipmap.i,R.mipmap.j

};
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        GridView gridView=findViewById(R.id.gridView);

        List> listitem=new ArrayList>();

        for(int i=0;i map=new HashMap();
            map.put("image",picture[i]);
            listitem.add(map);


        }
        SimpleAdapter simpleAdapter=new SimpleAdapter(this,listitem,R.layout.cell,
                new String[]{"image"},new  int[]{R.id.image});

        gridView.setAdapter(simpleAdapter);
    }
}

 代码都是跟着视频抄的，没有动过脑子，不知道为什么这么写，唉