安卓常见控件

  一：ScaleType

1：把小图片放入比图片大的scaletype中的八个属性

以下图片有属性分别对应的效果图

2：把大图片片放入比图片小的scaletype中的八个属性

以下图片有属性分别对应的效果图

二：进度条

1，进度分为ProgressBar和ProgressBar（horizontal）

前者是圆形进度条后者是水平进度条

今天我来就举个例子是用水平进度条

这是在xml文件中写的代码

<ProgressBar

    android:id="@+id/pb_progressBar_1"
    style="?android:attr/progressBarStyleHorizontal"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    />

<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"

    android:onClick="download"
    android:text="下载" />

这是在Java文件中写的代码

package com.example.g160828_android6_2_widget;

import android.content.Intent;
import
        android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageView;
import android.widget.ProgressBar;
import android.widget.Switch;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.ToggleButton;

public class MainActivity extends AppCompatActivity {

    private ProgressBar pb_progressBar_1;
    private TextView tv_main_1;
    private ImageView itv_main_1;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);
        //得到进度条的id
        pb_progressBar_1 = (ProgressBar) findViewById(R.id.pb_progressBar_1);
        //得到显示数字的ID
        tv_main_1 = (TextView) findViewById(R.id.tv_main_1);
    }
    //进度条

    public void download(View view) {
        new MyThread().start();
    }

    //子程序与主线之间的中间者
    Handler handler = new Handler() {
        //接收消息
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            int i = msg.what;
            tv_main_1.setText(i + "");
        }
    };

    //子程序
    class MyThread extends Thread {
        @Override
        public void run() {
            super.run();
            for (int i = 0; i <= 100; i++) {
                pb_progressBar_1.setProgress(i);
                //发消息
                handler.sendEmptyMessage(i);          
try {
    Random r=new Random();
 int n= r.nextInt(200);
    Thread.sleep(n);
} catch (InterruptedException e) {
    e.printStackTrace();
}
            }        }    }}

三：Switch滑动开关

这是在xml文件中写的代码

<Switch
    android:id="@+id/sw_switch1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="你点不点！"
    android:onClick="switch1"
  />
这是在Java文件中写的代码
public void switch1(View view) {
    boolean b = ((Switch) view).isChecked();
    if (b) {
        itv_main_1.setImageResource(R.drawable.mei_1);
        Toast.makeText(this, "  你已经开启了哦", Toast.LENGTH_SHORT).show();
    } else {
        itv_main_1.setImageResource(R.drawable.mei_2);
        Toast.makeText(this, "  你已经关闭了哦", Toast.LENGTH_SHORT).show();
    }
}
四：seekBar
这是在xml文件中写的代码
<ImageView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/iv_seekbar_1"
    android:src="@drawable/mei_1"

    />
<SeekBar
    android:id="@+id/sk_seekBar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    />
这是在Java文件中写的代码
package com.example.g160828_android6_2_widget;

import android.app.Activity;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.ImageView;
import android.widget.RatingBar;
import android.widget.SeekBar;
import android.widget.Toast;


public class SeekbarActivity extends AppCompatActivity {
//定义一个数组
private int image[]={R.drawable.mei_1,R.drawable.mei_2};
    private int imagetext=0;

    private ImageView iv_seekbar_1;
    private SeekBar sk_seekBar;
    private  int oop;
    private RatingBar ratingBar2;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_seekbar);
        //设置默认

        //获得控件的ID
        iv_seekbar_1 = (ImageView) findViewById(R.id.iv_seekbar_1);

        sk_seekBar = (SeekBar) findViewById(R.id.sk_seekBar);
        ratingBar2 = (RatingBar) findViewById(R.id.ratingBar2);
        //设置最大值
        sk_seekBar.setMax(255);
        //放到最大点
        sk_seekBar.setProgress(255);
         //放一个监听
        sk_seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            @Override
            public void onProgressChanged(SeekBar seekBar, int i, boolean b) {
               oop=i；
            }
            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {
                iv_seekbar_1.setImageAlpha(oop);
            }

            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {

            }
        });

    }





    public void select1(View view) {
        iv_seekbar_1.setImageResource(image[0]);
}

    public void select2(View view) {

        iv_seekbar_1.setImageResource(image[1]);
    }




}
五：RatingBar 五星好评
xml中
<RadioGroup
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="horizontal"
    android:id="@+id/rg_main_rg">
Java代码
ratingBar2.setOnRatingBarChangeListener(new RatingBar.OnRatingBarChangeListener() {
    @Override
    public void onRatingChanged(RatingBar ratingBar, float v, boolean b) {
        Toast.makeText(SeekbarActivity.this, v+"颗星星", Toast.LENGTH_SHORT).show();
    }
});