package com.example.paul_2.a5mai;
import android.content.pm.ActivityInfo;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import java.util.Random;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setContentView(R.layout.activity_main);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
start();
}
void start () {
//root layout
LinearLayout root = new LinearLayout(this);
root.setOrientation(LinearLayout.VERTICAL);
root.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,LinearLayout.LayoutParams.MATCH_PARENT));
setContentView(root);
//butonul de start
Button StartBTN = new Button(this);
StartBTN.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,LinearLayout.LayoutParams.WRAP_CONTENT));
StartBTN.setText("Click Me");
root.addView(StartBTN);
// contine toate cele 5 layouturi
final LinearLayout linearContainer=new LinearLayout(this);
linearContainer.setOrientation(LinearLayout.HORIZONTAL);
linearContainer.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,LinearLayout.LayoutParams.MATCH_PARENT));
root.addView(linearContainer);
//LINIA 1
final LinearLayout firstRow = new LinearLayout(this);
firstRow.setOrientation(LinearLayout.VERTICAL);
firstRow.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,LinearLayout.LayoutParams.MATCH_PARENT));
linearContainer.addView(firstRow);
//dimensiunea imaginii
RelativeLayout.LayoutParams params1 = new RelativeLayout.LayoutParams(200,200);
//params1.leftMargin =10;
//params1.topMargin = 10;
//final ImageView cherry = new ImageView(this);
//cherry.setBackgroundResource(R.drawable.cherry1);
//firstRow.addView(cherry,params1);
final ImageView imgView = new ImageView(this);
Random rand = new Random();
int rndInt = rand.nextInt(n) + 1; // n = the number of images, that start at idx 1
String imgName = "img" + rndInt;
int id = getResources().getIdentifier(imgName, "drawable", getPackageName());
imgView.setImageResource(id);
firstRow.addView(imgView, params1);
}
}
我需要帮助,了解我应该做什么才能展示" imgView"从3个不同的图像中随机抽取" drawable"夹。首先,我不知道我应该在String imgName =?之后写。其次,rndInt的值必须是3,我的意思是n = 3? (如果我有3张图片保存在" drawable"文件夹。请有人帮我这个,因为我需要这个用于学校。提前谢谢!