MainActivity
package uibestpractice.example.com.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.view.View;
import android.widget.Button;
import android.widget.EditText;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {
private List<Msg> msgList = new ArrayList<Msg>();
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 v) {
String content = inputText.getText().toString();
if (!"".equals(content)) {
Msg msg = new Msg(content, Msg.TYPE_SENT);
msgList.add(msg);
adapter.notifyItemInserted(msgList.size() - 1); // 当有新消息时，刷新ListView中的显示
msgRecyclerView.scrollToPosition(msgList.size() - 1); // 将ListView定位到最后一行
inputText.setText(""); // 清空输入框中的内容
}
}
});
}
private void initMsgs() {
Msg msg1 = new Msg("Hello guy.", Msg.TYPE_RECEIVED);
msgList.add(msg1);
Msg msg2 = new Msg("Hello. Who is that?", Msg.TYPE_SENT);
msgList.add(msg2);
Msg msg3 = new Msg("This is Tom. Nice talking to you. ", Msg.TYPE_RECEIVED);
msgList.add(msg3);
}
}
Msg
package uibestpractice.example.com.uibestpractice;
/**
* Created by toudou on 2017/3/10.
*/
public class Msg {
// 两个静态常量用于控制左右视图的隐藏
public static final int TYPE_RECEIVED = 0;
public static final int TYPE_SENT = 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;
}
}
MsgAdapter
package uibestpractice.example.com.uibestpractice;
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;
/**
* Created by toudou on 2017/3/10.
*/
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 itemView) {
super(itemView);
leftLayout = (LinearLayout) itemView.findViewById(R.id.left_layout);
rightLayout = (LinearLayout) itemView.findViewById(R.id.right_layout);
leftMsg = (TextView) itemView.findViewById(R.id.left_msg);
rightMsg = (TextView) itemView.findViewById(R.id.right_msg);
}
}
public MsgAdapter(List<Msg> msgList) {
mMsgList = msgList;
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
// View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.msg_item, parent, null);
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.msg_item, parent, false);
return new ViewHolder(view);
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
Msg msg = mMsgList.get(position);
if (msg.getType() == Msg.TYPE_RECEIVED) {
// 如果是收到的消息，则显示左边的消息布局，将右边的消息布局隐藏
holder.leftLayout.setVisibility(View.VISIBLE);
holder.rightLayout.setVisibility(View.GONE);
holder.leftMsg.setText(msg.getContent());
} else if (msg.getType() == Msg.TYPE_SENT) {
// 如果是发出的消息，则显示右边的消息布局，将左边的消息布局隐藏
holder.rightLayout.setVisibility(View.VISIBLE);
holder.leftLayout.setVisibility(View.GONE);
holder.rightMsg.setText(msg.getContent());
}
}
public int getItemCount() {
return mMsgList.size();
}
}
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:id="@+id/msg_recycler_view"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<EditText
android:id="@+id/input_text"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:hint="Type something here"
android:maxLines="2" />
<Button
android:id="@+id/send"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Send" />
</LinearLayout>
</LinearLayout>
msg_item.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="wrap_content"
android:padding="10dp"
>
<LinearLayout
android:id="@+id/left_layout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="left"
android:background="@drawable/message_left"
>
<TextView
android:id="@+id/left_msg"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_margin="10dp"
android:textColor="#fff"
/>
</LinearLayout>
<LinearLayout
android:id="@+id/right_layout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="right"
android:background="@drawable/message_right"
>
<TextView
android:id="@+id/right_msg"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_margin="10dp"
/>
</LinearLayout>
</LinearLayout>
报错：Error:Some file crunching failed, see logs for details
Error:Execution failed for task ':app:mergeDebugResources'.
Error: Some file crunching failed, see logs for details
03-15 13:52:24.347 11475-11475/? I/Atfwd_Daemon: result : -1 ,Init step :2 ,qmiErrorCode: 0
03-15 13:52:24.707 20505-21107/? D/PatchUpdateManager: deletePatch deletePatch is close ,may be a error
03-15 13:53:45.107 3803-5647/? E/audio_a2dp_hw: adev_set_parameters: ERROR: set param called even when stream out is null
03-15 13:53:49.307 3803-5647/? E/audio_a2dp_hw: adev_set_parameters: ERROR: set param called even when stream out is null
03-15 13:54:14.367 11475-11475/? I/Atfwd_Daemon: result : -1 ,Init step :2 ,qmiErrorCode: 0
03-15 13:56:09.387 11475-11475/? I/Atfwd_Daemon: result : -1 ,Init step :2 ,qmiErrorCode: 0
03-15 13:56:52.437 13980-13980/? W/ResourceType: Failure getting entry for 0x7f0c047a (t=11 e=1146) (error -75)
03-15 13:57:07.467 14123-14123/? W/ResourceType: Failure getting entry for 0x7f0c047a (t=11 e=1146) (error -75)
03-15 13:58:09.407 11475-11475/? I/Atfwd_Daemon: result : -1 ,Init step :2 ,qmiErrorCode: 0
03-15 13:58:34.417 593-593/? E/QC-QMI: qmuxd: RX on fd=25 returned error=0 errno[2:No such file or directory]
03-15 13:58:34.447 14451-14451/? I/Atfwd_Daemon: result : 255 ,Init step :0 ,qmiErrorCode: 0
03-15 13:58:34.447 14451-14451/? I/Atfwd_Daemon: result : 0 ,Init step :1 ,qmiErrorCode: 0
03-15 14:00:14.477 14451-14451/? I/Atfwd_Daemon: result : -1 ,Init step :2 ,qmiErrorCode: 0
03-15 14:01:59.497 14451-14451/? I/Atfwd_Daemon: result : -1 ,Init step :2 ,qmiErrorCode: 0
