How to Get Device Height and Width at Runtime?

2019-01-18 08:43发布

站内文章 / Java
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问题:

I am developing an app in which I have to make our app to fit for every device - for both tablet and android mobiles. Now I want to get the device height and width at runtime and implement it in my code so that my app works for both landscape and portrait.

My XML file is:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:layout_weight="2" android:orientation="vertical">

    <LinearLayout android:id="@+id/linearLayout1" android:layout_height="match_parent" 
    android:orientation="horizontal" android:layout_width="match_parent" 
    android:layout_weight="1">

        <LinearLayout android:id="@+id/linearLayout1" android:layout_height="match_parent"  
        android:orientation="vertical" android:layout_width="match_parent" 
         android:layout_weight="1" android:weightSum="100">
            <TextView  android:id="@+id/letter1" android:gravity="center" android:layout_width="fill_parent" android:layout_height="wrap_content"  android:layout_weight="60"></TextView>
            <TextView  android:id="@+id/letter2" android:gravity="center" android:layout_width="fill_parent" android:layout_height="wrap_content"  android:layout_weight="20"></TextView>
            <TextView  android:id="@+id/letter3" android:gravity="center" android:layout_width="fill_parent" android:layout_height="wrap_content"  android:layout_weight="20"></TextView>
        </LinearLayout>

        <LinearLayout android:id="@+id/linearLayout1" android:layout_height="match_parent"  
        android:gravity="center"
        android:orientation="horizontal" android:layout_width="match_parent" 
        android:layout_weight="1">
            <ImageView android:id="@+id/imag"  
            android:gravity="center"
            android:scaleType = "fitCenter"
            android:layout_height="fill_parent" 
            android:layout_width="fill_parent"
             android:layout_gravity="center">
        </ImageView>

        </LinearLayout>

    </LinearLayout>


        <LinearLayout android:layout_gravity="bottom" 
        android:id="@+id/linearLayout2" 
        android:layout_height="wrap_content" android:orientation="horizontal" android:layout_width="match_parent">
            <Button android:id="@+id/previous" android:layout_width="wrap_content" android:layout_weight="1" android:text="Previous" android:layout_height="wrap_content" ></Button>
            <Button android:id="@+id/practice" android:layout_width="wrap_content" android:layout_weight="1" android:text="Practice" android:layout_height="wrap_content" android:onClick="onClick"></Button>
            <Button android:id="@+id/home" android:layout_width="wrap_content" android:layout_weight="1" android:text="Home" android:layout_height="wrap_content"></Button>
            <Button android:id="@+id/spell" android:layout_width="wrap_content" android:layout_weight="1" android:text="Spell" android:layout_height="wrap_content" android:onClick="Content"></Button>
            <Button android:id="@+id/next" android:layout_width="wrap_content" android:layout_weight="1" android:text="Next" android:layout_height="wrap_content" android:onClick="Content"></Button>


        </LinearLayout>

</LinearLayout>

My Java file is:

package com.android;

import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Typeface;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import com.android.SimpleGestureFilter.SimpleGestureListener;

public class MySwara extends Activity implements SimpleGestureListener {


    private SimpleGestureFilter detector;
    private static int counter=-1;
    private String[] mBtn1 ={"C","D","E","F","G","H","IÄ","J","K","L","M","N","O","CA","CB"};
    private TextView txtLetter;
    private ImageView imgLetter;

    private int[] imgArr={R.drawable.w1,R.drawable.w2,R.drawable.w3,R.drawable.w4,R.drawable.w5,R.drawable.w6,R.drawable.w7,R.drawable.w8,R.drawable.w9,R.drawable.w10,R.drawable.w11,R.drawable.w12,
                            R.drawable.w13,R.drawable.w14,R.drawable.w15};
    private TextView txtKannada;
    private String[] mBtn2 = {"CgÀ¸À","DªÉÄ","E°","F±À","GqÀ","Hl","IĶ","J¯É","Kr","LzÀÄ","M¯É","N¯É","OµÀzsÀ",
            "CAUÀr","CB"};
    private String[] mBtn3 = {"ARASA","AME","ILI","ISA","UDA","UTA","RUSHI","ELE","EDI","AIDU","oLE","OLE","AUSHADA",
            "ANGADI","AHA"};
    private TextView txtEnglish;

    private int[] mAudio = {R.raw.a,R.raw.b,R.raw.c,R.raw.d,R.raw.e,R.raw.f,R.raw.g,R.raw.h,R.raw.i,R.raw.j,
            R.raw.k,R.raw.l,R.raw.m,R.raw.n,R.raw.o};
    protected MediaPlayer mp;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
            super.onCreate(savedInstanceState);
            setContentView(R.layout.content);   

            detector = new SimpleGestureFilter(this,this);
            if(counter == -1)
                counter =getIntent().getExtras().getInt("POSITION");
            Typeface tf = Typeface.createFromAsset(getBaseContext().getAssets(), "fonts/brhknd.ttf");
            txtLetter = (TextView)findViewById(R.id.letter1);
            txtKannada = (TextView)findViewById(R.id.letter2);
            txtEnglish = (TextView)findViewById(R.id.letter3);
            imgLetter = (ImageView)findViewById(R.id.imag);
            txtLetter.setTypeface(tf);      
            txtLetter.setText(mBtn1[counter]);
            //txtLetter.setTextSize(350);

            Bitmap bm = BitmapFactory.decodeResource(getResources(), imgArr[counter]);
            imgLetter.setImageBitmap(bm);

            txtKannada.setTypeface(tf);
            txtKannada.setText(mBtn2[counter]);
            //txtKannada.setTextSize(100);

            txtEnglish.setText(mBtn3[counter]);
            //txtEnglish.setTextSize(50);



            Button btnNext =  (Button)findViewById(R.id.next);
            btnNext.setOnClickListener(new OnClickListener() {

                @Override
                public void onClick(View v) {


                    if(counter<imgArr.length-1)
                        counter++;
                    changeContent();
                }
            });

            Button mPlay = (Button)findViewById(R.id.spell);
            mPlay.setOnClickListener(new OnClickListener() {

                @Override
                public void onClick(View v) {
                    mp = MediaPlayer.create(MySwara.this, mAudio[counter]);   
                    mp.start();

                }
            });


            Button btnPrvs =  (Button)findViewById(R.id.previous);
            btnPrvs.setOnClickListener(new OnClickListener() {

                @Override
                public void onClick(View v) {


                    if(counter>0)
                        counter--;
                    changeContent();
                }
            });


            Button btnPractice = (Button)findViewById(R.id.practice);
            btnPractice.setOnClickListener(new OnClickListener() {

                @Override
                public void onClick(View v) {
                    Intent intent = new Intent(MySwara.this,DrawingActivity.class);
                    startActivity(intent);

                }
            });
            Button btnHome = (Button)findViewById(R.id.home);
            btnHome.setOnClickListener(new OnClickListener() {

                @Override
                public void onClick(View v) {
                    Intent intent = new Intent(MySwara.this,mainClass.class);
                    startActivity(intent);

                }
            });
    }



    public void changeContent()
    {

        txtLetter.setText(mBtn1[counter]);
        txtKannada.setText(mBtn2[counter]);
        txtEnglish.setText(mBtn3[counter]);
        //imgLetter.setBackgroundResource(imgArr[counter]);
        Bitmap bm = BitmapFactory.decodeResource(getResources(), imgArr[counter]);
        imgLetter.setImageBitmap(bm);

    }


@Override
        public boolean dispatchTouchEvent(MotionEvent me){
          this.detector.onTouchEvent(me);
         return super.dispatchTouchEvent(me);
        }
    @Override
     public void onSwipe(int direction) {
      String str = "";

      switch (direction) {

      case SimpleGestureFilter.SWIPE_RIGHT : str = "Swipe Right";

                                                if(counter>0)
                                                    counter--;
                                                    changeContent();
                                               break;
      case SimpleGestureFilter.SWIPE_LEFT :  str = "Swipe Left";
                                            if(counter<imgArr.length-1)
                                                counter++;
                                                changeContent();
                                                     break;

      }

     }



    @Override
    public void onDoubleTap() {
        // TODO Auto-generated method stub

    }


    }

回答1:

Display mDisplay = activity.getWindowManager().getDefaultDisplay();
final int width  = mDisplay.getWidth();
final int height = mDisplay.getHeight();

This way you can get the screen size.

Since this API is depricated in the new SDK versions you can use this.

DisplayMetrics displayMetrics = context.getResources().getDisplayMetrics();
int width = displayMetrics.widthPixels;
int height = displayMetrics.heightPixels;


回答2:

In a Activity scope do:

DisplayMetrics dm = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(dm);
int w = dm.widthPixels; // etc...


回答3:

In the onCreate of your activity you can do 

mScreenWidth = getActivity().getWindowManager().getDefaultDisplay().getWidth();

mScreenHeight = getActivity().getWindowManager().getDefaultDisplay().getHeight();

and later use these variables to access device height and width



回答4:

this is how you get the available screen dimensions. This will get you not the raw pixel size but the available space of your window/activity.

    Point outSize = new Point();
    getWindowManager().getDefaultDisplay().getSize(outSize);

Also you can have different layout xml files for both landscape and portrait. Put your xml for portrait in res/layout-port. Layout for landscape can be put into res/layout-land. You should read up how android handles resources



回答5:

You can get all the display related information using the class Display Metrics http://developer.android.com/reference/android/util/DisplayMetrics.html

you would require 

DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);

After this all the required information will be present in your metrics object.

The other option is to call 

getActivity().getWindowManager().getDefaultDisplay().getWidth()
getActivity().getWindowManager().getDefaultDisplay().getHeight()


回答6:

I'm not going to tell you how to get the screen dimensions, as everybody else here did that already. I'm pointing you to a link from the android developer dev guide, which should teach you how to design and develop for devices of different screen sizes.

After reading, come back and tell us again that you still want to get the width and height of the screen.



标签： java android android-layout android-intent android-emulator
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