Androidアプリ開発

サンプル集

  1. Sample
  2. NavigationDrawerActivityのHomeFragmentへImageView画像を動的に初期表示位置を指定する。

サンプル

HomeFragment.java

					
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.res.AssetManager;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Point;
import android.os.Bundle;
import android.util.Log;
import android.util.SparseBooleanArray;
import android.view.Display;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.widget.Toolbar;
import androidx.constraintlayout.widget.ConstraintLayout;
import androidx.fragment.app.Fragment;
import androidx.lifecycle.Observer;
import androidx.lifecycle.ViewModelProvider;

import com.example.navidrawact.Async;
import com.example.navidrawact.MainActivity;
import com.example.navidrawact.R;
import com.example.navidrawact.databinding.FragmentHomeBinding;

import java.io.File;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class HomeFragment extends Fragment implements View.OnTouchListener {

	private HomeViewModel homeViewModel;
	private FragmentHomeBinding binding;
	static public ImageView im;
	static public LinearLayout.LayoutParams layoutParams;
	static public ConstraintLayout layout;
	private int preX, preY;
	int width;
	int height;
	static public androidx.constraintlayout.widget.ConstraintLayout homeFragment;
	static public Toolbar gtoolbar;

	public View onCreateView(@NonNull LayoutInflater inflater,
								ViewGroup container, Bundle savedInstanceState) {
		homeViewModel =
				new ViewModelProvider(this).get(HomeViewModel.class);

		binding = FragmentHomeBinding.inflate(inflater, container, false);
		View root = binding.getRoot();
		Display display = getActivity().getWindowManager().getDefaultDisplay();
		Point size = new Point();
		display.getSize(size);
		width = size.x;
		height = size.y;
		final TextView textView = binding.textHome;
		homeViewModel.getText().observe(getViewLifecycleOwner(), new Observer() {
			@Override
			public void onChanged(@Nullable String s) {
				textView.setText(s);
			}
		});
		homeFragment = (androidx.constraintlayout.widget.ConstraintLayout) root.findViewById(R.id.root_home);
		//layoutにimageViewを追加 text_home
		im = (ImageView) new ImageView(root.getContext());
		ViewGroup.MarginLayoutParams lp1 = (ViewGroup.MarginLayoutParams) im.getLayoutParams();
		AssetManager assets = getResources().getAssets();
		try (InputStream istream = assets.open("21016726.jpg")) {
			Bitmap bitmap = BitmapFactory.decodeStream(istream);
			im.setImageBitmap(bitmap);
		} catch (Exception e) {
			e.printStackTrace();
		}
		// イメージViewの幅・高さ
		layoutParams = new LinearLayout.LayoutParams(200, 200);
		im.setLayoutParams(layoutParams);
		homeFragment.addView(im);
		// タッチイベント登録
		root.setOnTouchListener((View.OnTouchListener) this);
		Async task = new Async(this);
		task.execute("Param1");
		return root;
	}

	@Override
	public void onDestroyView() {
		super.onDestroyView();
		binding = null;
	}

	@Override
	public boolean onTouch(View v, MotionEvent event) {
		// x,y 位置取得
		int newX = (int) event.getRawX();
		int newY = (int) event.getRawY() - MainActivity.gtoolbar.getHeight(); // タイトル行を無効にする。

		switch (event.getAction()) {
			// タッチダウンでドラッグされた
			case MotionEvent.ACTION_MOVE:
				int dx = im.getLeft() + (newX - preX);
				int dy = im.getTop() + (newY - preY);
				int imgW = dx + im.getWidth();
				int imgH = dy + im.getHeight();
				// 画像の位置を設定する
				im.layout(dx, dy, imgW, imgH);
				break;
			case MotionEvent.ACTION_DOWN:
				break;
			default:
				break;
		}
		// タッチした位置を古い位置とする
		preX = newX;
		preY = newY;

		return true;
	}
}

MainActivity.java

					
import android.os.Bundle;
import android.view.MenuItem;
import android.view.View;
import android.view.Menu;

import com.google.android.material.snackbar.Snackbar;
import com.google.android.material.navigation.NavigationView;

import androidx.appcompat.widget.Toolbar;
import androidx.navigation.NavController;
import androidx.navigation.Navigation;
import androidx.navigation.ui.AppBarConfiguration;
import androidx.navigation.ui.NavigationUI;
import androidx.drawerlayout.widget.DrawerLayout;
import androidx.appcompat.app.AppCompatActivity;

import com.example.navidrawact.databinding.ActivityMainBinding;

public class MainActivity extends AppCompatActivity {

	private AppBarConfiguration mAppBarConfiguration;
	private ActivityMainBinding binding;
	static public Toolbar gtoolbar;

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

		binding = ActivityMainBinding.inflate(getLayoutInflater());
		setContentView(binding.getRoot());

		setSupportActionBar(binding.appBarMain.toolbar);
		binding.appBarMain.fab.setOnClickListener(new View.OnClickListener() {
			@Override
			public void onClick(View view) {
				Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
						.setAction("Action", null).show();
			}
		});

        // ツールバー
        gtoolbar = findViewById(R.id.toolbar);
		DrawerLayout drawer = binding.drawerLayout;
		NavigationView navigationView = binding.navView;
		// Passing each menu ID as a set of Ids because each
		// menu should be considered as top level destinations.
		mAppBarConfiguration = new AppBarConfiguration.Builder(
				R.id.nav_home, R.id.nav_gallery, R.id.nav_slideshow)
				.setDrawerLayout(drawer)
				.build();
		NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment_content_main);
		NavigationUI.setupActionBarWithNavController(this, navController, mAppBarConfiguration);
		NavigationUI.setupWithNavController(navigationView, navController);
	}

	@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;
	}

	@Override
	public boolean onSupportNavigateUp() {
		NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment_content_main);
		return NavigationUI.navigateUp(navController, mAppBarConfiguration)
				|| super.onSupportNavigateUp();
	}
	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		// Handle action bar item clicks here. The action bar will
		// automatically handle clicks on the Home/Up button, so long
		// as you specify a parent activity in AndroidManifest.xml.
		return super.onOptionsItemSelected(item);
	}
}

HomeFragment.java

					
						
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".ui.home.HomeFragment"
    android:id="@+id/root_home">

    <TextView
        android:id="@+id/text_home"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        android:textAlignment="center"
        android:textSize="20sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

Async.java

					
import android.app.Activity;
import android.content.DialogInterface;
import android.os.AsyncTask;
import android.util.Log;
import android.view.View;
import android.widget.LinearLayout;

import androidx.constraintlayout.widget.ConstraintLayout;

import com.example.navidrawact.ui.home.HomeFragment;

import java.util.ArrayList;

import static java.lang.Thread.sleep;

/**
	* Created by kazuhide on 2015/04/25.
	*/
public class Async
		extends AsyncTask {

	HomeFragment fragmet01;
	final String TAG = "AsyncTask";
	static public int pos = 0;


	public Async(HomeFragment fragmet01) {
		super();
		this.fragmet01 = fragmet01;

	}

	@Override
	protected void onPreExecute() {
		Log.d(TAG, "onPreExecute");

	}


	@Override
	protected Integer doInBackground(String... params) {
		try {
			sleep(300);

		} catch (InterruptedException e) {
			e.printStackTrace();
			return -1;
		}
		return 0;
	}


	@Override
	protected void onProgressUpdate(Integer... values) {
		Log.d(TAG, "onProgressUpdate - " + values[0]);
	}

	@Override
	protected void onCancelled() {
		Log.d(TAG, "onCancelled");
	}

	@Override
	protected void onPostExecute(Integer result) {
		// imageViewの表示位置を指定する。
		int dx = fragmet01.im.getLeft() + 200;
		int dy = fragmet01.im.getTop() + 200;
		int imgW = dx + fragmet01.im.getWidth();
		int imgH = dy + fragmet01.im.getHeight();
		fragmet01.im.layout(dx, dy, imgW, imgH);
	}


}

HomeFlagmetでImageViewの初期位置を指定します。