Android 聊天介面

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介面：

1.主介面 activity_main.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:background="#d8e0e8">    <android.support.v7.widget.RecyclerView        android:layout_width="match_parent"        android:layout_height="0dp"        android:id="@+id/msg_recycler_view"        android:layout_weight="1" />    <LinearLayout        android:layout_width="match_parent"        android:layout_height="wrap_content" >    <EditText        android:layout_width="0dp"        android:layout_height="wrap_content"        android:id="@+id/input_text"        android:layout_weight="1"        android:hint="Type something here"        android:maxLines="2" />    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:id="@+id/send"        android:text="Send" />    </LinearLayout></LinearLayout>

2.訊息介面 msg_item.xml

<?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="wrap_content"    android:orientation="vertical"    android:padding="10dp">    <LinearLayout        android:orientation="vertical"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:id="@+id/left_layout"        android:layout_gravity="left"        android:background="@drawable/left9">        <TextView            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:id="@+id/left_msg"            android:layout_gravity="center"            android:layout_margin="10dp"            android:textColor="#fff"            />    </LinearLayout>    <LinearLayout        android:orientation="vertical"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:id="@+id/right_layout"        android:layout_gravity="right"        android:background="@drawable/right">        <TextView            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:id="@+id/right_msg"            android:layout_gravity="center"            android:layout_margin="10dp"            android:textColor="#fff"            />    </LinearLayout></LinearLayout>

功能實現 

1.main      MainActivity.java

package com.example.ken.uibestpractice;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.support.v7.widget.LinearLayoutManager;import android.support.v7.widget.RecyclerView;import android.text.method.LinkMovementMethod;import android.view.View;import android.widget.Button;import android.widget.EditText;import java.util.ArrayList;import java.util.List;import java.util.ResourceBundle;public class MainActivity extends AppCompatActivity {    private List<Msg> msgList = new ArrayList<>();    private EditText inputtext;    private Button send;    private RecyclerView msgRecyclerView;    private MsgAdapter adapter;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initMsgs();        inputtext = (EditText) findViewById(R.id.input_text);        send = (Button) findViewById(R.id.send);        msgRecyclerView = (RecyclerView) findViewById(R.id.msg_recycler_view);        LinearLayoutManager layoutManager = new LinearLayoutManager(this);        msgRecyclerView.setLayoutManager(layoutManager);        adapter = new MsgAdapter(msgList);        msgRecyclerView.setAdapter(adapter);        send.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                String content = inputtext.getText().toString();                if(""!=content){                    Msg msg = new Msg(content, Msg.TYPE_SEND);                    msgList.add(msg);                    adapter.notifyItemInserted(msgList.size()-1);                    msgRecyclerView.scrollToPosition(msgList.size()-1);                    inputtext.setText("");                }            }        });    }    private void initMsgs(){        Msg msg1 = new Msg("Hello guy.", Msg.TYPE_RECEIVED);        msgList.add(msg1);        Msg msg2 = new Msg("Hello. Who is it?", Msg.TYPE_SEND);        msgList.add(msg2);        Msg msg3 = new Msg("This is Tom. Nice to talking to you.", Msg.TYPE_RECEIVED);        msgList.add(msg3);    }}

2.訊息類 Msg.java

package com.example.ken.uibestpractice;public class Msg {    public static final int TYPE_RECEIVED = 0;    public static final int TYPE_SEND = 1;    private String content;    private int type;    public Msg(String content, int type){        this.content = content;        this.type = type;    }    public String getContent() {        return content;    }    public int getType() {        return type;    }}

3.訊息適配器  MsgAdapter.java

package com.example.ken.uibestpractice;import android.support.annotation.NonNull;import android.support.v7.widget.RecyclerView;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.LinearLayout;import android.widget.TextView;import java.util.List;public class MsgAdapter extends RecyclerView.Adapter<MsgAdapter.ViewHolder> {    private List<Msg> mMsgList;    static class ViewHolder extends RecyclerView.ViewHolder{        LinearLayout leftlayout;        LinearLayout rightlayout;        TextView leftMsg;        TextView rightMsg;        public ViewHolder(View view){            super(view);            leftlayout = (LinearLayout) view.findViewById(R.id.left_layout);            rightlayout = (LinearLayout) view.findViewById(R.id.right_layout);            leftMsg = (TextView) view.findViewById(R.id.left_msg);            rightMsg = (TextView) view.findViewById(R.id.right_msg);        }    }    public MsgAdapter(List<Msg> msgList){        mMsgList = msgList;    }    @NonNull    @Override    public ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {        View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.msg_item, viewGroup, false);        return new ViewHolder(view);    }    @Override    public void onBindViewHolder(@NonNull ViewHolder viewHolder, int i) {        Msg msg = mMsgList.get(i);        if(msg.getType() == Msg.TYPE_RECEIVED){            viewHolder.leftlayout.setVisibility(View.VISIBLE);            viewHolder.rightlayout.setVisibility(View.GONE);            viewHolder.leftMsg.setText(msg.getContent());        }        if(msg.getType() == Msg.TYPE_SEND){            viewHolder.leftlayout.setVisibility(View.GONE);            viewHolder.rightlayout.setVisibility(View.VISIBLE);            viewHolder.rightMsg.setText(msg.getContent());        }    }    @Override    public int getItemCount() {        return mMsgList.size();    }}

實現的效果是這樣的：

Android 聊天介面