如何在 Android 中的 TextView 中对齐文本?
此示例演示如何在 Android 中的 TextView 中对齐文本。
步骤 1 - 在 Android Studio 中创建一个新项目,转到文件 ⇒ 新建项目,并填写所有必需的详细信息以创建新项目。
步骤 2 - 将以下代码添加到 res/layout/activity_main.xml 中。
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout 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=".MainActivity"> <android.support.v7.widget.RecyclerView android:id="@+id/recycler_view" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_alignParentTop="true" android:layout_centerHorizontal="true" android:scrollbars="none" /> </RelativeLayout>
步骤 3 - 将以下代码添加到 res/layout/list_item.xml 中。
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:id="@+id/container" android:padding="16dp" android:layout_height="match_parent"> <TextView android:id="@+id/song_title" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="New Text" android:layout_marginTop="10dp" android:textSize="18dp" android:textStyle="bold" android:textColor="@color/colorPrimaryDark"/> <TextView android:id="@+id/song_year" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="New Text" android:textColor="#000" android:layout_below="@+id/song_title" android:layout_alignLeft="@+id/song_title" android:layout_alignStart="@+id/song_title" android:layout_marginTop="20dp" /> <TextView android:id="@+id/song_author" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="New Text" android:textColor="#000" android:layout_alignTop="@+id/song_year" android:layout_alignParentRight="true" android:layout_alignParentEnd="true" /> </RelativeLayout>
步骤 4 - 将以下代码添加到 src/MainActivity.java 中。
package com.app.sample; import androidx.appcompat.app.AppCompatActivity; import androidx.recyclerview.widget.LinearLayoutManager; import androidx.recyclerview.widget.RecyclerView; import android.os.Bundle; import java.util.ArrayList; import java.util.List; public class MainActivity extends AppCompatActivity { private final String TAG = "MainActivity"; private RecyclerView recyclerView; private LinearLayoutManager layoutManager; private RecyclerViewAdapter adapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); recyclerView = (RecyclerView)findViewById(R.id.recycler_view); recyclerView.addItemDecoration(new SimpleDividerItemDecoration(this)); layoutManager = new LinearLayoutManager(MainActivity.this); recyclerView.setLayoutManager(layoutManager); List<ItemObject> posts = returnListItems(); adapter = new RecyclerViewAdapter(MainActivity.this, posts); recyclerView.setAdapter(adapter); } private List<ItemObject> returnListItems(){ List<ItemObject> items = new ArrayList<ItemObject>(); items.add(new ItemObject("Blank Space", "Taylor Swift", "2016")); items.add(new ItemObject("Uptown Funk", "Mark Ronson", "2016")); items.add(new ItemObject("Can't Feel My Face", "The Weeknd", "2016")); items.add(new ItemObject("Cheerleader", "OMI", "2016")); items.add(new ItemObject("What Do You Mean?", "Justin Bieber", "2016")); items.add(new ItemObject("Hello", "Adele", "2016")); return items; } }
步骤 5 - 将以下代码添加到 src/ItemObject.java 中。
package com.app.sample; public class ItemObject { private String songTitle; private String songYear; private String songAuthor; public ItemObject(String songTitle, String songYear, String songAuthor) { this.songTitle = songTitle; this.songYear = songYear; this.songAuthor = songAuthor; } public String getSongTitle() { return songTitle; } public String getSongYear() { return songYear; } public String getSongAuthor() { return songAuthor; } }
步骤 6 - 将以下代码添加到 src/RecyclerViewAdapter.java 中。
package com.app.sample; import android.content.Context; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import androidx.recyclerview.widget.RecyclerView; import java.util.List; public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewHolders>{ private List<ItemObject> itemList; private Context context; public RecyclerViewAdapter(Context context, List<ItemObject> itemList) { this.itemList = itemList; this.context = context; } @Override public RecyclerViewHolders onCreateViewHolder(ViewGroup parent, int viewType) { View layoutView = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_item, null); RecyclerViewHolders rcv = new RecyclerViewHolders(layoutView); return rcv; } @Override public void onBindViewHolder(RecyclerViewHolders holder, int position) { holder.songTitle.setText("Song Title: " + itemList.get(position).getSongTitle()); holder.songYear.setText("Song Year: " + itemList.get(position).getSongYear()); holder.songAuthor.setText("Song Author: " + itemList.get(position).getSongAuthor()); } @Override public int getItemCount() { return this.itemList.size(); } }
步骤 7 - 将以下代码添加到 src/RecyclerViewHolders.java 中。
package com.app.sample; import android.util.SparseBooleanArray; import android.view.View; import android.widget.TextView; import androidx.recyclerview.widget.RecyclerView; public class RecyclerViewHolders extends RecyclerView.ViewHolder implements View.OnClickListener { public TextView songTitle; public TextView songYear; public TextView songAuthor; private SparseBooleanArray selectedItems = new SparseBooleanArray(); public RecyclerViewHolders(View itemView) { super(itemView); itemView.setOnClickListener(this); songTitle = (TextView)itemView.findViewById(R.id.song_title); songYear = (TextView)itemView.findViewById(R.id.song_year); songAuthor = (TextView)itemView.findViewById(R.id.song_author); } @Override public void onClick(View view) { if (selectedItems.get(getAdapterPosition(), false)) { selectedItems.delete(getAdapterPosition()); view.setSelected(false); } else { selectedItems.put(getAdapterPosition(), true); view.setSelected(true); } } }
步骤 8 - 将以下代码添加到 Manifests/AndroidManifest.xml 中。
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.app.sample"> <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/AppTheme"> <activity android:name=".MainActivity"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
让我们尝试运行您的应用程序。我假设您已将您的实际 Android 移动设备连接到您的计算机。要从 Android Studio 运行应用程序,请打开您的项目中的一个活动文件,然后点击运行 工具栏中的图标。选择您的移动设备作为选项,然后检查您的移动设备,它将显示您的默认屏幕 -
点击 这里 下载项目代码。
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